I wonder why that unit is better though. AB got a lot of burn towards end of season, when KG really lifted his game. He wasn't so good in the first half. I'd like to see those lineups split by each half of the season to further understand.
Let's assume the wing/guard spots are filled by these guys: Rondo / AB / Allen / Pierce / Green.
Rondo is going to start - he's the best player on the team, and he'll play the most minutes. AB has to play when Rondo is out - he's the only other guy that can man the PG at all. But traditionally if Rondo is out, Pierce is in. Pierce is the only play maker in the half court in that group. Allen's offense comes primarily off set plays and fast breaks where he's out in transition or catch and shoot trailer.
I'd rather see a starting lineup of Rondo / Allen / Green, with Green taking on the role of AB (catch and shoot in the corner, backcuts / flashing to the hoop, running in transition) - I think his height will be an advantage for finishing at the rim.
Pierce can come in at SG, SF, and with Green sliding to PF from SF in a small ball lineup, really he can come off the bench anytime. He also won't have to play as many minutes and less time covering elite SFs. All things pierce needs at this point.
For Ray playing with Rondo helps him - he has less ball handling responsibility, Rondo gets him better looks, and he lacks the positional flexibility of Pierce. Let Ray Allen start, but take his minutes down to 24-30 range.
AB won't be ready for the start of the season anyways, so bring back Dooling or someone similar to backup Rondo until then, once AB has his legs, use him as a change of pace guard off the bench. He'll still get minutes, but he'll also be easier to keep out of matchups where his lack of height causes problems.