The 2015 class was jettisoned because it was a disaster. Not many of those guys provided a positive contribution last year and I think Matta even told boosters somewhere along the way that the attrition was a positive development.
Hayes and Koenig are definitely close to their ceiling, but Wisconsin was great last year. Don't really see why they wouldn't be the pick to win it.
After them I think it is sort of a crap shoot. Purdue and IU both lose key pieces, but return some guys that I think could probably be first team All-Big Ten (OG, Bryant, Vince, Swanigan).
MSU loses a ton, more than just about anyone, but has a great class. They have depth issues up front already though and I think it's underrated just how much shooting they lose.
OSU is kind of like Michigan in that they return a lot of guys that have kind of been around, but never really taken the next step. Michigan was the better team last year (51 vs 76 KP), but it seems like they are in the same spot in most projections.
I'm high on Maryland because the best PG wins a lot of games and I think Trimble is going to have a bounce back year. And they have the easiest conference slate.