At this moment I think he would be a good candidate.
Considering players that came off the bench at least in 20 games (not much, but if they don't start the rest of the season with possibilities of playing half the games as substitutes) he is
2nd in points (15.7, behind Crawford with 16.4, ahead of Lou Williams with 15.5 and Ryan Anderson with 14.
and
7th in assists (3.9, behind Mo Williams with 5.3, Ginobili with 4.6, Lin with 4.5 and Jameer Nelson, Augustin and Price all between 4.1 and 3.9)
Obviously there are other candidates, besides the ones I mentioned, like Iguodala, Gobert (although he's starting now), Lamb, Chalmers, Patterson or Josh Smith, to name a few. But his impact has been bigger than most, I think.
Do you believe he has a chance?