7. Chris Jericho
Of all the potential mystery partners on this list, Chris Jericho would probably make the least sense from a storyline perspective. A return would certainly garner a big pop and probably improve the quality of the match itself (Y2J can still wrestle like nobody's business - as proven at the 'Beast In The East' Network-exclusive earlier this year), but wouldn't make much sense in the grand scheme of things. In fairness, Jericho is Jericho, and will be accepted by WWE fans whenever he makes an appearance. As long as his appearance could be justified in the storyline, however tenuously, I certainly wouldn't be complaining should the iconic countdown hit the TitanTron this Sunday.