Green is more of a SF than anything. He could even be seen as Scottie Pippen Point Forward type offensively. He isn't a PF in the rebounding sense..but he can defend many PFs though. I don't see him playing big minutes at the 4.
If healthy Delonte will play no matter which PG they bring in as a 3rd pg. I can see the Rondo, Ray, Delonte, Pierce, Garnett playing some. Doc is going to go with the normal starting guys first...and hopefully adjusts as needed depending on whats working the 2nd half. We will have depth to do that. We have players with different specialties.
And if we get Corey Brewer, we would have a longer defender if needed though I still don't think he would be an upgrade defensively against Shooting Guards over DWest. Dwest is darn pesky out there. But some of the bigger SG, I think it would be beneficial to have Brewer out there for some minutes instead of Delonte.