If you can trade Lee for a player with size you do it. You can always sign Delonte to take his place. Delonte's familiar with the team and also familiar with Terry from their days in Dallas.
Forget Delonte. If the Celtics had ANY interest in bringing West back, he:
A. Never would have gone to Dallas in the first place
B. Would have already been brought back to fill in Rondo's spot
Doesn't it say something that Dallas - the team that's most intimately familiar now with Delonte's struggles - wants absolutely nothing to do with him?