I think some are placing too much emphasis on Offense, wanting ALL 5 guys on the floor to be the best 5 offensive players. Theiro is the closest thing we have to a defensive stopper. He is easily our most physical player. He is our best rebounder, and he drives to the basket with authority.
I don't think anyone is suggesting play Theiro 36min and Mitchell 15min. But unless you are a Mashburn/Prince/Davis/Ulis elite-level player, you don't need to be out there 36min. Most guys can't play "all-out" for that long on a consistent basis. But Mitchell for 28 and Theiro for 22 is a better split. We all know Cal will be slow to cut Edwards minutes, but right now he is the least contributing player out of the top 8, so he should be the one cut the most for Bradshaw.
But once Onyenso is added to the mix, then however many minutes he gets also gets sliced off a number of other players too.