IT this, Turner that, why is it everyone else's fault that Smart sucks?
This. It's not like he doesn't get minutes or opportunities. He's just a bad offensive player right now, there's no way around that. It doesn't matter who he plays with, he's limited. If he was better offensively, CBS would leave him out there more. You can't really say he has potential to be a 2-way player, when he's ineffective on one end of the floor. For comparison's sake, IT had a TS% of 56% last season, Smart's was 46%, so to answer OP's question: yes, IT has leapfrogged him offensively.
If Smart can 1.) Improve his shot 2.) take smarter shots (46% of shots last season were 3's, that jumped up to 55% in the playoffs), CBS may trust him more later in games and he might crack 30 mins per game.
Smart is not a point guard.
The quicker people accept this, the better off they'll be. I think at his best, he can be a secondary ballhandler like ET was or like Iguodala for GSW, but I don't think he can be a starting caliber PG on a good team. His decision making just isn't there.