The problem with the Big Ten and the NCAA tournament has been one of style of play. The Big Ten referees allow a very physical game. When in the NCAA, you do not tend to have these refs. The new refs do not allow the same style. Big Ten teams tend to have issues adjusting. Big Ten teams also tend to have a greater "Big Man Focus" than do other conferences. For some reason, refs think that Big Ten centers can take more abuse (and concurrent fouling) and do not call obvious fouls on Big Ten centers.
Let's cite the CSU-Fullerton game in the NCAA: Haas was egregiously fouled, resulting in serious injury and essentially ending Purdue's chances of a deep run. While a foul was called on the play, it was not deemed a technical foul and the player committing it was not ejected, iirc. It was so bad that it resulted in a rule change. However, Haas was being treated similarly throughout the game and it was tolerated. Look at a similar game with St. Peter's last year in how Edey was treated.
What needs to happen for Big Ten teams to go far in the tournament is the league instructing refs to call a game like other conferences do. Refs should be followed closely and if they do not change their pattern then they should be gone, mid-season or not. That would clean up play and help improve tournament chances