Wow...you mean that both Avery Bradley AND Rajon Rondo are going to go back to pressing on defence?
I would have to say that a backcourt rotation of Rondo, Bradley, Pressey and Smart would surely have to be (by far) the best defensive backcourt rotation in the entire league. Can anybody think of a better one??
As for Rondo defending the off-guards, I don't think you'll see much of that. I think you'll find that most of the time it will be Rondo+Bradley or Smart+Bradley or Rondo+Smart in the backcourt.
In the first case, I imagine Bradley will defend the SG and Rondo will defend the PG.
In the second case, I imagine Bradley will defend the PG and Smart will defend the SG (but will switch positions on offense).
In the third case, I imagine Rondo will defend the PG and Smart will defend the SG.
I honestly believe that this is going to be one hell of a three man rotation, and I think a lot of people throughout the league are dramatically underestimating the impact these three guys will have.
Then consider the fact that you also have Pressey (himself, an exceptional on-ball defender) as your third string PG and Thornton (who can score in bucketloads at times) your third string SG.
Even at the SF spot, we still have incredible depth with Jeff Green as the starting SF, Evan Turner as the backup (he'd be a starter on many teams if Indiana didn't help him ruin his reputation) and Gerald Wallace as a third string SF.
Plus you have Young who is basically your fourth string SG/SF.
That is one hell of a deep roster through the first three positions and gives the Celtics a LOT of versatility. It doesn't really matter what type of lineup you're looking for, he has a solution...
Defensive rotation:
Smart, Bradley, Wallace
Ball movement:
Rondo, Smart, Turner
Shooting:
Bradley, Thornton, Green (yeah I know, not optimal - short spurts only)
Slashing:
Rondo, Smart, Green
Big:
Smart, Turner, Green
Small/athletic:
Pressey/Rondo, Bradley, Green
Rebounding:
Rondo, Bradley, Turner
Overall:
Rondo, Bradley, Green
The possibilities really are endless. The only thing the team truly lacks is a legit PG with an outside shot...Bradley or Thornton would probably have to fill that role.