#2 EC3
EC3 is an incredibly curious case. He has everything, he's proven it in Impact and in NXT, he's a star ready-made and waiting to be unleashed. However, rumour has it that a match with Dean Ambrose before his departure was not well received and we've hardly seen EC3 since.
In fact, now he's just a guy who stands with a cup in his hand. A nice cameo at Drake Maverick's wedding as best man was the last time EC3 was prominently featured, and even that wasn't on television.
Annoyingly, The Top One Percent could be an incredible addition to the WWE roster if used correctly, and he was a huge fan favourite in NXT and upon his main roster debut, but it seems like one bad impression has been lasting, and may just signal the downward spiral that is EC3's WWE career - but if they can save it, he could be a major player!