I think Marshall is one of the ten best coaches in the country.
ND plays 4 guards sometimes, but Vastoria and Conaughton are basically 3's on the college level - and the latter plays much bigger than he is. Throw in Grant's length, and the fact that those three plus the point guard can all shoot the 3, and ND can get away with it. Most teams can't. And in other games this year ND has put in the other big kid who is the de facto 6th man to play with Augustine, when they are getting beat up inside or on the boards.
Wichita has a number of forwards who can play down low and on the boards, in addition to Carter. Both very different from a size standpoint than St. John's regular lineup this year.