#1 Bobby Lashley

Bobby Lashley hasn't really had the best of runs since he returned to the WWE. He was a wrecking machine when he left WWE, but his current avatar is anything but that. He's not imposing anymore. He's turned heel and has been bending over in front of the live audience and doing things which we didn't really expect from him.
He's lost to Finn Balor recently and lost his Intercontinental title and just recently an interview of him surfaced where he talked about leaving WWE for other pastures. For someone as gifted and imposing as Bobby, it does seem like he gets underused a tad too much.
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A feud against AJ would do him a world of good and bring him back under some spotlight which has been taken away from him recently because of all that his character has done. It doesn't matter whether he takes part as a heel or a face, a match against AJ would bring the best out of him and could kickstart his jump to the main event.