Wooo! This one could be tricky because of WWE's ongoing lawsuit with TNA for allegedly tampering with contacts, including the Nature Boy. He'd be an amazing choice to host any episode of Raw or Smackdown.
Probably the longest of long shots, because he's under contract for TNA, but hey, Christian did show up for Slammiversary. It would be amazing if he were part of the build to Raw, but Vince would want him to do a lot more than Christian did.
Coach recently gave an interview where he talked about how his association with the WWE initially held him back when he got to ESPN. It'd be nice to see the Coach called back for one night only, but I have my doubts that he would want to do it.
Technically, I don't think Shane ever was a full authority figure, but whatever. He left to do his own thing, and I'd really only want to see him back if he was willing to get into the ring again. He might be too old for that now, but Shane always provided a "Holy ****" moment when he got between the ropes.
Sean Morley (Val Venis)
Hello Ladies! Seriously, how awesome would it be to see Val Venis on Raw one more time? Unfortunately, he dropped that gimmick when he became Chief Morley, so even if he did come back, it might not be that exciting.