Locked On Celtics Podcast: Joe Mazzulla's Quest for Toughness & Tom Thibodeau Spills Knicks' Secrets

Date: October 21, 2025
Host: John Karalis
Guest: Tom Westerholm
Episode Theme:
The main focus of this episode is exploring Joe Mazzulla’s mission to instill "grit" and toughness in the Celtics ahead of the new season, pondering if a team full of “nice guys” can find the edge needed to compete for a title. In the latter half, the conversation shifts to Tom Thibodeau’s unique visit to Celtics practice—how the recently-fired Knicks coach provided Jaylen Brown with in-depth insight into how the Knicks game-planned to stop him in last year’s playoffs.

Joe Mazzulla’s Toughness Quest: Can Nice Guys Get Gritty?

[01:11] – [14:25]

Celtics’ Current Identity: Finesse over Grit

• John Karalis sets up the central question: "How the heck is Joe Mazzulla gonna take a bunch of guys who are finesse players, basically a bunch of nice guys, and turn them into a gritty bunch with chips on their shoulders?" [01:11]
• Tom Westerholm jokes about the lack of tough-guy personas on the roster, referencing the days of Jay Crowder and others with more of a palpable edge:

  “I don’t see Jay Crowder out there. I don’t see anybody who’s gonna boop John Wall… They’re all fine young men.” [03:42]

• The duo laments that the roster’s “toughness scale” peaks around a “six out of ten”—with Jalen Brown and Peyton Pritchard as the grittiest current Celtics.
• Karalis: “When I talk about gritty...the Celtics need to just go out there, be willing to take the contact, not shy away from the contact, not be annoyed by the contact, not be annoyed by the work. They have to be the aggressors.” [05:20]
• Westerholm: “Pritchard is not afraid of contact…he has some dog in him…But it's hard to imagine Peyton Pritchard ever getting into a shoving match with someone.” [06:03 & 06:28]

Analogies: Moving From the ‘Gated Community’ to the ‘Tough Neighborhood’

• Karalis delivers an analogy for NBA teams:

  “Finesse team is the gated community you move into when you get a big promotion… you can be able to ride your bike in the street, and I don’t have to… Sometimes you forget to lock the door at night.” [07:39]
  "You become the gritty team because you got no choice... you got to carry your keys like they're a weapon." [08:41]

• Reference is made to the Isaiah Thomas-era Celtics as peak “grit” – a team that forced opponents to “cross the street” when walking by them. [09:09]

The Challenge: Can You Teach Toughness?

• “How does Joe get these guys there—to walk in, flip a switch? …Sam Houser is just this, aw shucks, Midwestern, Wisconsin kid… If I had a daughter, if she brought home basically any one of these guys from the Celtics, I'd be like, ‘Oh, well, this is a fine young gentleman.’” (Karalis) [10:35]
• Both hosts question whether “toughness” can truly be coached or if it must come from within the roster—especially absent a natural enforcer or agitator.

How Joe Mazzulla and Jalen Brown Must Lead

[14:25] – [22:42]

Can Toughness Be Developed, or Is It Innate?

• Tom Westerholm expresses concern:

  “I think it's really hard. … It's hard to change your nature. … Who's going to be pushing and shoving? Who’s going to be getting in there?” [14:25]

• Discussion settles on Jalen Brown as the key to setting the tone:

  “I think it’s on Jalen…Joe and Jalen have to get together and be like, hey look, go get thrown out. … Jalen has to be the guy diving on the floor, getting in there and rebounding.” (Karalis) [16:27–17:11]

• Karalis points out that leadership by example is paramount:

  “If you show the film and Jaylen Brown’s not boxing out, then they have no chance of doing this. … Jaylen has to at least start the game, first shot up, he's got to be in there, take a foul, push it, do something, set the tone.” [17:00]

• Jalen's willingness to play “above expectations” and “take slights personally” is debated as an essential step back to a grittier mentality—referencing the Brad Stevens and Isaiah Thomas teams who “took so much offense to everything.” [19:51]
• The tension between “well-adjusted” modern pros and the kind of “maniac edge” it takes to win is highlighted:

  "I want everybody to go to therapy and be well adjusted except for the professional athletes that I'm rooting for." (Karalis, quoting a comedian) [20:52]

• “Somebody has to be a lunatic…Somebody has to be Joe Mazzulla.” [22:16]

Tom Thibodeau Visits Celtics: Knicks’ Secrets Revealed

[25:01] – [33:24]

The Most Unusual Offseason Gift: Enemy Coach as Mentor

• John Corrales describes seeing Tom Thibodeau at Celtics practice:

  “Shocked when I turned around and saw Tom Thibodeau…shoutout to Tom Thibodeau for getting out there and dropping a few lbs.” [25:01]

• Explains the unique value: Thibodeau, recently fired by the Knicks after eliminating the Celtics, gave Jaylen Brown a full debrief of how the Knicks scouted and stopped him.
• Corrales:

  “Jalen was talking about, you know, Tom was telling me, you know, basically the game plan…‘Here’s what we saw, here’s how we covered you, here’s what we tried to do.’ And Jalen said, look, if you’re humble enough to listen, you’re going to get better.” [25:49]

• Pull Quote—Jalen Brown (as recounted by Corrales, [25:49]):

  “If you're humble enough to listen, you're going to get better.”

• Westerholm ponders:

  “It’s a very unique opportunity in that way…Tibbs is going to be paid by the Knicks for quite some time still, and he's just out here telling the Knicks rival superstars, ‘Here's how we beat you.’” [27:21]

• Westerholm highlights the growth mindset at work:

  "If you're humble enough to look at your flaws and to like, identify your flaws, examine them, put them under a microscope and then go out and try to fix them, that's the key." [27:49]

Knicks’ Messy Offseason: The Ultimate Irony

• A report from Mark Stein is dropped ([29:02])—the Knicks looked into luring Joe Mazzulla after firing Thibodeau; instead, their ex-coach now assists Boston.
• Corrales sums it up:

  “The New York Knicks just paid Tom Thibodeau to give Jalen Brown the full scouting report on how they guarded him. That is incredible.” [29:40]

The Value of NBA Coaching Fraternity

• Discussion of the NBA’s “coaching fraternity”—fired coaches dropping in across the league to share schemes or motivational insight.
• Taylor Jenkins (ex-Grizzlies) mentioned as another consultant at Celtics practice for schemes to help with rebounding and mindset.

Notable Quotes and Memorable Moments

• “Every team wants to be a finesse team. … You become the gritty team because you got no choice.” (Karalis, [07:39])
• “You always have to have this one thing that makes you do the extra things that make you so damn good.” (Karalis, [21:19])
• "Somebody has to be a lunatic. Somebody has to be Joe Mazzulla … He would do it." (Karalis, [22:14])
• “If you’re humble enough to listen, you’re going to get better.” (Jalen Brown via Karalis, [25:49])
• “The Knicks just paid Tom Thibodeau to give Jalen Brown the full scouting report on how they guarded him. That is incredible." (Karalis, [29:40])
• "What can you say? He just beat you. … It’s like when the guy who robs you comes in and it's like, here's how you fix all your security stuff.” (Karalis, [32:23])

Segment Timestamps

• 01:11 – Setting up the toughness question for Joe Mazzulla's Celtics
• 03:42 – Toughness scale and “nice guys” roster, no enforcers
• 07:39 – "Gated community" vs. "tough neighborhood" analogy
• 10:35 – How do you teach grit to a roster of nice guys?
• 14:25 – Can toughness be developed or is it innate (Jalen as the key)?
• 17:00-18:39 – Jalen Brown’s responsibility to set the gritty tone
• 19:51 – The need for a team to “take offense” and play with a chip
• 25:01 – Tom Thibodeau at practice; Jalen Brown’s open-mindedness
• 27:49 – Growth mindset: humility and improvement
• 29:02-29:40 – Knicks’ fiasco trying to lure Mazzulla; Thibs helps Boston
• 31:58-32:23 – Accepting “white hat” feedback from the coach who beat you

Conclusion

This episode offers a thoughtful exploration into the Celtics’ challenges in developing toughness and the complex psychological landscape of NBA “grit.” While host John Karalis and guest Tom Westerholm admit there’s no easy answer to coach up “dog mentality,” they zero in on Jalen Brown’s importance and leadership by example. The show’s second half delivers unique insight into how ex-rival coach Tom Thibodeau’s visit might give Boston a crucial edge—if the team is humble enough to listen and learn.

For new and returning listeners:
The episode maintains a conversational, occasionally self-deprecating tone (true to Locked On Celtics), packed with analogies, personal observations, and a healthy dose of Celtics fandom.