If a guy can't perform off the bench, even though he's been in the league for five years, what makes one think that he's going to be any better as a starter?
It should be easier for Green to play well against other bench players. I shudder to think what he would do when matched up more often with top level talents who start.
This proposal makes no sense.
There is a significant attitude difference between being a bench player and starting. Some people are better suited for coming off the bench while some struggle in that role.
Jeff Green CAN perform both off the bench and as a starter- his career stats provide proof of this (the Jeff Green is a career scrub argument is pretty ridiculous)-the issue is getting him to perform consistently for this team. It is at least possible that starting him would help him develop that consistency.
Green was pedestrian at best as a starter in OKC. Pierce has been a HOFer as a starter. it makes no sense changing Pierce's role on the team to give a middling player like Green a starting role in the hope that he's going to become anything more than what he was in OKC.
What Green needs to do is embrace the 6th man role, and play aggressively against the other team's bench players. If he's all that talented, as the OP seems to think, he can become a James Harden type here for the Celtics.
I'm convinced that Green is nothing but an average NBA player, someone who has a ton of skill, but because he has very little intestinal fortitude, is stuck at being average. One can hope that, in his 5th year, that Green is going to flip some switch and become a stud, but I'm not holding my breath.
He was a stupid acquisition, who suffered a serious medical setback, and then was rewarded with a foolishly out-sized contract. I hope I'm wrong and Green will morph into an impact NBA player.