The clip sounded crazy but they’re just arguing levels. How many chips can you recall where there wasn’t a top 10 guy on the roster? Brunson isn’t chump but he’s not one of THOSE guys. And frankly, the only times THAT GUY was under 6’4 were Steph and Isiah Thomas.
You could probably argue that it's gotta be a top-5 player with a top-20 or 30 guy behind him. Since 2015 the Finals MVPs have been
Bron (twice)
KD (twice)
Kawhi
Giannis
Curry
Jokic
Iguodala is the outlier in 2015, and was BS. Steph was the real MVP.
Then it's Kawhi, Bron, Dirk, and Kobe.
So it's even more limiting when we look at it that way. Though, I would argue that I don't think the "short guys don't win" thing is as relevant in the modern NBA. The rules have tilted so heavily toward ball-handlers that I think a player like Brunson, Ja, Mitchell or Fox can be the best player across any 7-game series (To Clarify: Not EVERY series, but any series...if they get hot, they can outscore and outplay ANYONE for 7 games).
My main marker for "can a short guy be THE guy" is efficiency. Has that player managed 25 PPG on 47% or higher across a season? It's fairly arbitrary, but basically, if you could round up a guard's shooting percentage to about 50% AND he's giving you 25 ppg a night, then I believe you have a championship-caliber first option.