Well, this guard rotation could be tricky. Last year our four guards averaged these minutes:
Rondo 37 mpg
Terry 32 mpg
Lee 30 mpg
Bradley 21 mpg for the season; however, 33 mpg in March when he fully claimed the starting role.
Even in a 3 man rotation, there wouldn't be enough minutes for everyone to stay at their minutes from last season. Throw in the fourth player, and everything gets thrown out of whack. Given those minutes, there's 96 minutes at those two positions to attempt to fit in 132 minutes. That's an extra 36 mpg.
So, what to do?
Shave 3 mpg off Rondo, and bring him down to 34 mpg. Down to 33.
Shave 7 mpg off Terry. He's 35, 25 mpg should suit him fine. Down to 26.
Bring Lee and Bradley down to 25 mpg. That shaves off another 13 minutes. Down to 13.
Now at this point, it becomes quite tough. The only way not to avoid cutting Bradley, Terry, and Lee down to 20 mpg (or someone essentially out) is to play Lee some time at the 3 spot. The problem there is that means that Green has to play even more at the 4 spot. However, if Sullinger doesn't prove he belongs right away, there's minutes to be had there. So we could do something like this at the 3.
Pierce 28 mpg, Lee 10 mpg, Green 10 mpg.
Then give Green another 15-20 mpg at the 4 spot.
Does it leave us a bit undersized? Yes. But it gives all four of our guards rotation quality minutes. And unless Sullinger steps in and is absolutely stunning, commanding 25+ mpg, we're probably better off going with some talented small ball lineups, than playing larger, but less talented lineups.