Wow, how deluded is Coach anyway? He really thinks that he's in control of this game, doesn't he? There were votes for Debby and instead of thinking that maybe he's not in control, he thinks instead that they were just taking the coward's way out. If you are planning on voting someone out, then how can you call them a coward because they don't simply want to roll over and take it?
Honestly, I hope that voting Debby out now wasn't a mistake. I understand their concern that Debby is manipulative and willing to turn on anyone, but everyone knows that and no one will trust her because of it. Coach, on the other hand, might actually have a chance at winning an immunity challange.
Plus, and to me, this is what seals the deal - At this point, everyone thinks they are in control of the game (don't ask me why), so there is no rocking the boat. If they had voted out Coach, then Debby would have still felt like you were letting her into the alliance, so there is no reason for further manipulation. On the other hand, voting out Debby and Coach suddenly realizes that he's on the outs so who knows what kinds of manipulations he's going to whip up.
It's the old adage - keep your friends close and your enemies closer. They just pushed Coach away and perhaps turned him into a loose cannon. From the previews next week, it looks like Erin might do somethink to inadvertantly rock the boat and if she feels vulnerable because of it, it might be an in for Coach even if he doesn't win the challenge.