#5 Adam Cole
Much like The Shield ruled the roost on the main roster, The Undisputed ERA calls the shots in NXT right now. One of the members of The Undisputed ERA who can certainly break out and become a huge singles performer is Adam Cole Bay Bay! The man has all the tools to become a top star in WWE very soon.
We've only seen him work as a heel in NXT but he has excelled at every given opportunity. While his size may prove to be a detriment to an extent, WWE is no longer the land of the giants. Adam Cole could certainly, upon his call-up, take up the Dean Ambrose spot in the current roster.
Just like Dean Ambrose, Cole too has come from the independents and excelled and thrived while in NXT. If he gets called up after WrestleMania, he could be a worthy replacement for Ambrose.