This is always a really fun question before the season, because it requires predicting levels of strife and suffering for a team that just did everything they could in the offseason to avoid that kind of thing. My money is probably on Mike McDaniel or Brian Daboll, considering those are teams teetering on the edge of something awful. Slight edge to McDaniel, though, since he has some serious skeptics around the league and media (I heard Mike Lombardi call him "the Disk Jockey" which cannot be a complement).