#1 Mojo Rawley

While the jury is still out on this new 'yelling at himself in the mirror' phase of Rawley's main-roster tenure, this might be the third strike in trying to get over as a believable WWE superstar.
His Andre the Giant match win was mainly due to the mainstream appeal of having Rob Gronkowski show up at WrestleMania. His tag team with Zack Ryder didn't last long on the main roster either.
He's shown more potential as a heel than he did as a grown man hyped up on sugar all the time.
Some former athletes don't always have the greatest success when trying out pro wrestling and Rawley has found it difficult to stand out in WWE.
He does seem like he loves the business and he hasn't been constantly booked into storylines on the main roster. So those are two factors which might keep him around.
But a lot of guys who think they can make it in pro wrestling simply because they were former athletes don't understand that guys like Daniel Bryan, Sami Zayn and Samoa Joe get over because A) they toiled away on the independent scene for much of their careers and B) hardcore fans and wrestlers respect wrestlers like that more so than failed athletes.
Rawley could find his footing elsewhere in another promotion, but I don't think he would bring the WWE house down if they decided to cut ties with the former NFL player.
Becky Lynch has been challenged HERE.