Do you think that the NCAA simply hands out medical redshirts to college hockey players who are diagnosed as jerks? It's fairly safe to assume that unless there were other factors besides a player simply being a difficult person to deal with, Hirsch never would have been granted an extra year of eligibility.
I think Lucia did a very decent thing by giving Tyler a year to get the situation resolved and then taking him back. He must have had reason to believe that Hirsch had the problem under control. It's too bad it didn't work out because Tyler is a very talented player who could have been an asset to the Gophers. The fact that Hirsch, his family and the Minnesota coaching staff are saying so little about what happened convinces me that whatever the problem is, they either can't or don't want to discuss it publicly. That should tell you that there's more to the situation than meets the eye.