You're being very naive.
TT was much improved in the second half of last season and probably was looking at this year to be his breakout year.
He is a good guy, but he is also going to want to get paid and be a long term starter somewhere. If the writing is on the wall that he won't be a starter here long term, he is not going to stick around and sign a below market deal to be a bench player on this team. He will move on to somewhere he has a chance to start.
It is the same thing with Bennett. He was the #1 pick in the draft, and is not going to be content to come off the bench forever, particularly not if he is more effective than the guy starting in front of him.
TT is not some late first round pick just hoping to hang on as a bench player for a $4-5 million extension after his rookie deal. He would probably tell you that himself. I am positive he thinks he can be someone's long term starter at PF, and he is not going to stay here to be a bench player long term.
He will do it and be a happy warrior while he is on the squad without making any waves, but he is not going to re-sign here to be Bennett's back up in a few years when he is up for an extension.