#2 Batista
Rumours suggest that Batista wants to make another WWE comeback, but the company isn't too keen on it. After the debacle in the leadup to WrestleMania 30, one can understand why. This is precisely one of the reasons why Batista supposedly wants to return. He wants a better run than that last time, where he got caught up in circumstances beyond his control. After seeing Rey Mysterio's triumphant Royal Rumble return, One can imagine what he's thinking.
While a full-time deal wouldn't be advisable due to his age and the need to let the younger stars shine brighter, a per appearance deal could be just what the doctor ordered. Batista is a big name and could be part of memorable angles with the likes of Braun Strowman and Drew McIntyre, to name a few.
Appearances now and then to advance an angle or big match would satisfy the Animal and probably the fanbase as well.