Fears may be their best player, but the two big men, Kohler and Cooper, are really the identity of the team. They're the fulcrum of the half-court offense, both in terms of initiating their sets and finishing them. At 6'9, 240 and 6'11, 230, respectively, both are well-equipped physically to perform the critical screening duties that Tom Izzo's offense requires. They're also skilled enough to operate from the high post and run dribble-handoffs on the perimeter. This allows them to quickly reverse the ball and re-load the post until they can create a better angle on the entry pass.
And make no mistake, this offense is designed to feed the post first and foremost. Both big men are fairly efficient on the low block and also pretty adept at finding cutters out of doubles. Pay close attention to Coen Carr - he compensates for his shooting deficiencies (he's only 29% from three) with smart, timely cuts that often result in thunderous dunks. He's among the national leaders in that category for a reason.
Since MSU lacks perimeter creators outside of Fears, it becomes all the more imperative that their big men create crevices with their off-ball screens to simplify reads for their slashers. Carr, Kur Teng, and Jordan Scott are all capable secondary creators who can find the open guy when the defense is scrambling.
On the other end, Izzo has managed to coax just enough rim protection out of the pair to construct a conservative defense based on condensing the floor and cleaning up the glass. Neither Kohler nor Cooper is particularly quick, but they're not laboring, either. Positionally and structurally, the two of them have been sound enough to anchor a top 15 defense. Experience helps there.
Overall, it's pretty much your standard low ceiling, high floor Izzo team. Their half-court offense is effective but not nearly as imaginative as UConn's - most of their alignments start with big men at both elbows, where they'll either flare out to the wing to screen off the ball or continue to the top of the key to set a ball screen. It's probably closer to the flex offense than it is UConn's.
My gut tells me UConn should win this game. They're not a particularly difficult team to prepare for, and from a talent standpoint they're equal at best. I could see them struggling to score in the half-court. Fears generates a lot of his offense in transition, which UConn traditionally has excelled at limiting. Assuming UConn dictates the tempo (which I assume it will), it should choke out most of Sparty's transition opportunities and bottle up Fears to the extent that it's possible.
Izzo's a heck of a coach, but he's far more renowned for his consistency than he is for his ability to topple great teams. I don't know if this UConn team is great, but if they are they should win this game.