I think we first need to establish that the change happened earlier than "mid season" since we went from 6-4 to have a 15-3 run in a tough conference. I honestly think that the McGary thing played a big role. I suspect that the lip service Beilein payed in the fall to making McGary a 4 and GR3 a 3 was fairly accurate and that they were planning to go into the season running a lot of offense through McGary and have LeVert come off the bench. Once McGary's back flared up to the point where they realized he was an unknown, I think Beilein went back to his roots. He starting running the offense mostly through Stauskas, LeVert stepped up and became the secondary scorer, GR3's role gradually went back to being what it was last year, and the centers went back to what they did with the Morris offense. I think it took a while to work out the kinks with everyone's role and once McGary wasn't an option it focused their efforts.
that is nice bonus change