My opinion is that this talk about a 10-12 man rotation is because Smart fears making the tough decisions and telling hi hometown friend MT, that he'll only get 15-20 mins per, or telling one of IT/Brooks they're a strict backup and will only get 15-20 mins per. Hope I'm wrong, but my guess is he doesn't have the balls to make the tough decisions, whereas just playing everyone out of position and going small, and switching whole lineups in an attempt to keep everyone happy is much easier. He can still be everyones friend that way, well, until their agents call.
You don't want to give an $8M (or whatever figure MT is making) that you signed to a long contract only last summer, only 15-20 minutes a game. Frankly, MT is too good to settle for that, and we have lot tied in him for that.
I understand your point though. If IT is more productive overall, and two can't share the floor due to size, then MT should see reduced minutes. Trade is the obvious solution there, though of course, that's easier said than done.
Before Rockets dropped the Asik bombshell on Bulls, I thought they were the perfect trading partners. They needed an SG upgrade anyway, had a big guard in Rose to play alongside MT (though he shall be out most of this year), and some defensive minded big men we could use.
I doubt they match offer on Asik. If they do, we might be able to get Gibson from them.
Another poster had suggested Noah. I don't think they shall pay Asik to let Noah go. Even Gibson is unlikely, but if they match, and the season doesn't go too well, they might be forced to make a move.