To be fair, it goes beyond Philbin. From what I understand, Lamar Miller was pissed with Campbell and Tannenbaum because of how they handled him late in the season.
They essentially stopped giving him the football to try to reduce his market value, and I don't blame him for being mad about it.
That actually backfired too, since Miller never even got a chance to really get feature back carries, everyone gave him the benefit of the doubt and just thought the Dolphins were stupid for not letting him. Nobody took them at face value that he couldn't handle the load because he never got the opportunity to prove or disprove them.