TP, Rollie.
Since returning from injury, Smart has really taken a step forward on the offensive end. His raw stats look better, but more importantly he's being featured as a primary ball-handler, making excellent passes/reads, driving to the rim with authority, running the P&R well and recently even his shot has been starting to fall. All those things are great for his future, and like you said he's only 21! This isn't even the start of what he can be if all goes right for him.
The "bust" idea was ridiculous anyway. A guy who's a future-DPOY candidate and isn't a total zero on offense is a very valuable player, especially with the game moving towards the perimeter. Last season, Stevens purposely put Smart out there with Rondo, Thomas or ET and pretty much never let him run the offense, keeping him out at the 3 and leaving him as the 5th option. The fans may not have liked it, but Smart's defense made him deserving of major PT but his offense just wasn't there yet. Were starting to see the fruits of the gradual learning curve CBS has given Marcus.
It's amazing how good a coach CBS is. Just this year alone, Thomas, Crowder, Bradley, Olynyk, Smart and Turner (even Sully to some extent) have really improved their games. Every single one of those guys is more valuable right now than they were a year ago. Crowder went from a throw-in on the Rondo deal to being discussed as the headliner for a potential Blake Griffin or Kevin Love trade. In just one year! Amazing. Can't wait to see what he can do with this team as it grows and adds for talent.