He was playing well as a starter. Was shooting close to 50 percent and improving in other facets.
I don't want to gang up on Marcus (I tend to see more hope for him than others) but that is just not factually true.
As a starter, he has shot 40% FG% this year. It's true that that is better than the the 33.3% he has shot from the bench, but it's a long way from 50%. Overall, even as a starter his true scoring efficiency is still an awful 48.7% TS (league average is around 53-54%).
That isn't really playing "well" on offense. It's just not as bad as his numbers off the bench.
All that said, I've seen positive signs in recent games. He has dramatically reduced the number of threes that he is shooting -- so that is not hurting the team as much. And when he has been on the floor, Brad has had Marcus handle the ball more -- even sometimes when Thomas is also on the floor -- which removes the need for him to be an outside shooter. And to be fair, Smart is not bad at all as a ball handler and passer. His TO rates are not as low as Thomas', but they are low. And the other positive thing is that when they do want Marcus to score, more and more they are using mid-and-short-range post-ups and simple floater shots from the mid-paint area. Places where he actually has semi-decent touch on his shots and he can use his body to create a shot for.
To me, for Marcus to succeed on offense, it is all about needing to play within himself first. I think it was a mistake to try to turn him into volume three point shooter when he came out of college with such a visibly broken 3PT shot. Right now, Smart needs to play a more Rondo-style of point in order to have value on offense.