A bunch of spot-on posts in this one. Size and Strength being the two main issues, Payne aside. And since Payne's not 6'11"+, they need some other bangers which they don't have.
Hoiberg has showed you can get over the hump in a hurry with the right addition(s). For them it was Rienk Mast to complement an underrated roster, where they can play 8 guys and not drop off much if at all. I bring them up as early in the year many here wanted to compare the two programs and the talk was "we can't finish worse than Nebraska," . . .Hoiberg had not been able to turn them, etc. So in this case, a lot of patience at that school has paid off. We'll see about next year when they lose their slayer Tominaga.
I think hitting on a capable inside player and one big guard, would have the Gophers right there. We'll see!