#2 EC3

EC3 seems to have bad luck when it comes to his time in WWE.
The Superstar is just unable to catch his big break. However, as has been proven time and time again on Impact Wrestling, EC3 is more than capable of holding his own, be it in the ring or on the mic.
Since coming to WWE, his NXT run did not really live up to expectations, and he has not done much at all on the main roster, other than a few segments with Dean Ambrose before the latter left for AEW and a few segments with the WWE 24/7 Championship.
However, in AEW, he would be able to do wonders at the moment. Imagining a feud between MJF and EC3 is enough for fans to want EC3 to head over to the promotion. Given the charisma of both Superstars, it is almost ensured that their matches and their promos would be must-watch.
It is, in fact, possible that they could even form a faction together given that they could share a similar arrogant heel gimmick.