I really like Delonte, and have argued in favor of bringing him back in other threads, but I agree that he is a bit redundant with Terry on board. Cs really need more of a backup SG, not a backup combo guard.
Here's one way to take a look at our roster:
Rondo/Terry/Moore
AB/ ? /Christmas?
Pierce/Green/Joseph?
Bass/Sully/JJJ
KG/Wilcox/Melo
The biggest question mark is still at the 2, especially given AB's surgery.
If the Cs can fill that using the vet min (preserving the BAE for later opportunities -- unless, for some magical reason Lee wants the BAE), that would be ideal. Cs also would want someone who "knows their role" and will be happy to take fewer minutes and disappear on the bench once AB is back, and when and if the youngsters (e.g.: Moore) start to emerge.
I think Quisy could fit this role. Potentially also players like Roger Mason, maybe Josh Childress.