Absolutely agree about Triple H not being in the match. Logically, it doesn't really make sense. Why would he want other wrestlers to do his bidding for him when so much is at stake? I'm willing to give WWE a pass on this though, because I'm pretty sure HHH will get involved during the match in some capacity. I'm thinking there's gotta be a classic HHH moment where he retrieves his trusty sledgehammer from under the ring and sets his sights on the final survivor for Team Cena - either Cena himself or Ryback.
In a way, this actually makes more sense from a kayfabe standpoint. If Triple H can just watch at ringside and then cheat to take out the final member of Team Cena, isn't that the better heel move? He doesn't need to do the "fair" thing and make himself a member of the match when he has the means and the power to screw the other team over using heel tactics. I'm assuming HHH gets involved somehow, but if he doesn't, then I agree that the WWE is definitely asking us to suspend some major disbelief.