Anderson has played relatively significant minutes thus far and will likely remain a rotation player when healthy. He also wouldn't have fared much better in that match-up. In blowout situations, it's best to play the bottom 5; Spurs are just imbalanced.
Again, lack of rebounding never stopped Diaw and Bonner from being long time rotation players. Besides, this team has a bunch of freakishly long perimeter players, who punch above their weight on the glass.
End of bench guy, who's a clear rotation player on most teams, who aren't archaic.
Anderson will more than likely be re-signed. Think Gay is more likely than not, but too soon to have a real sense. If he is and remains 6th man, Bertans will basically be blocked from a path to the rotation.