#1 Zack Ryder

While this last pick might seem a little anticlimactic, especially with everyone else on this list, it has to be noted that Zack Ryder is one of the most beloved Superstars in modern day WWE history. He is a man that got himself over on his own terms and did everything in his power to make himself the next big thing.
Ryder is someone who can get a legitimate pop out of the audience, and he could perhaps be brought back to battle R-Truth for the 24/7 Title. Not only would it make for some nice midcard content, it would also be yet another great accolade in Ryder's career.
Look who just shut down all of Tony Khan's critics! More HERE.
If nothing else, these surprise returns are something that WWE fans seem to look forward to. It also adds a little bit of extra excitement to the night's show, which is always fun. Maybe it doesn't result in anything too meaningful, but it's nice to have a little surprise packed in there for good measure.