The Celtics coaching staff deserves a ton of credit for force feeding Smart into 3PT shots to help him develop the shot early on amidst a ton of criticism from fans/media. That's really where the difference between Stevens and Doc is that I notice in the short-term. He's been willing to develop certain parts of players' games that seemed unlikely to amount to anything. Smart turning into a 34% 3PT shooter from the NBA line after shooting 29% from the college line is really impressive, and I'm glad the staff made him focus on that all of last year. It's a two way street, though, and Smart had to put the work in also. I'm pretty sure Doc would have had some kind of panic attack from all the 3s Smart shot last year.
On the other hand, the experiment hasn't been working as well with Sullinger (yet?).