Thanks @davidblackwell for the prize for Butler. This is an interesting perspective on the tournament.
I'll pick Texas A&M over Michigan.

My brackets always include BigTen Teams and they have often let me down. This year, the selection committee gave almost no respect to the conference by selecting only four teams. Yet, they all got high seeds, which is perplexing to me.

Michigan won their previous contest on a prayer 3 pointer by a freshman. By all other perspectives, they should have lost that game. Texas A&M whooped North Carolina.

Purdue played Butler without Isaac Haas and they pulled off the win. I think Texas Tech over Purdue is also possible.

My pick for an underdog win is: Texas A&M over Michigan.