#3 EC3

Much like Baron Corbin, EC3 and Kurt Angle have unfinished business, having feuded previously on Impact Wrestling a few years ago, for the World Heavyweight title.
WWE announced a few months ago that EC3 would debut on the main roster, but have still not revealed if he will be on RAW or SmackDown, despite wrestling on RAW, against Dean Ambrose, winning one match and losing the other.
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While we aren't sure where his future lies, the hints suggest that RAW could be where EC3 will end up on the main roster. EC3 has huge experience in pro wrestling and has all the ingredients to be a huge star on RAW.
A short feud with Angle makes sense, considering their past, while a large part of the WWE Universe who may not know of him will get a taste of what he can offer, following a WM35 match with Angle.