He's had pretty great results in the NCAA. Built Union into a reputable program and turned Providence into a powerful program. But that doesn't necessarily mean results at the WJC.
I have similar thoughts as
@Pavel Buchnevich. He's known for being a tactician highly focused on his defensive system. Can he adapt his (or a) system to the player pool he'll have here or will he try to force the players to play his normal system as Sandelin did to the detriment of the 2020 team? It's hard to get a random collection of players to do well in a system that doesn't fit them in just 2-3 weeks.
The latter is my concern with Leaman. I always worry about coaches that will have a level of talent at their disposal here that they'd never dream of having in their regular coaching job and not knowing what to do with it besides forcing it into their normal system. That's how you end up with guys like Trevor Zegras dominating but only getting 4th line minutes.
Hopefully Leaman - and USAH - learn that crucial lesson from Sandelin's failure in 2020. If I had my druthers USAH wouldn't have named an NCAA coach to change things up but the pickings are slim for American coaches when you rule out the NCAA.
I would have rather seen a highly experienced unemployed coach looking for a chance to get back in coaching, whether as an audition or just to relive that life for a short period (i.e. like Ron Wilson at the 2016 WJC) or an up-and-comer (i.e. Tri City's Anthony Noreen) who is probably aching for a showcase opportunity to audition for a promotion.
But given they rarely go outside the NCAA, there's an obvious up-and-comer leading Denver (David Carle) who would have been a really interesting choice. He'd be able to relate to the players in a way that others won't since he's only 30 and I think his style would translate well to a WJC tournament as well. I'm sure it's on a matter of time before he gets tapped for this tournament.
Leaman is one of the obvious choices if you're choosing from the NCAA ranks. And I hope he's far less stubborn than some of his predecessors and proves me wrong.