They called the pass because it was the only way to get three attempts rather than 2. A third play had to be a pass (TD or stop the clock), and 2nd down was the logical time to do it. Problem was that NE was expecting it for those reasons.
Oh, and there were dissension rumors months ago about that very thing. Like I said, between lockerroom discord with players and players, players and ownership, as well as players and coaches now, I'd expect a very similar meltdown as we saw with SF coming up. That's of course assuming that they even decide to hang on to Marshawn.