I'm not going to pretend like that is a good stat, but Howard had a pretty fast pace of play and the guy has a pretty high usage rate. I'm not making an excuse, but that kind of PG is just going to have way more TOs than the average PG. Very few PG play at that accelerated rate. Part of it is just simple math, Howard played about 6 more possessions per game than Minnesota and then you're also just more likely to commit a TO playing fast.
Again, I'm not defending the TOs and I'm sure there will be some head scratching moments with Mitchell next year. But you take the good with the bad, and he'll add more good to this team.
On a side note, Pepperdine also had a really fast pace of play. So I hope big Payne is getting his laps in this summer, he could get some easy buckets if he can keep up with those two.