#1 Seth Rollins
The reason why Seth Rollins tops this list can be linked to his past. If you take a look at the career of Seth Rollins, he was the man who was holding 2 titles at the same time.
Now if we take a look at his present state, he is involved in the mid card storylines despite giving unbelievable matches, even with the likes of Mojo Rawley and Jinder Mahal. He has been the most cheered babyface of 2018, but still he is not in the Universal Title picture.
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The reason behind this is (as it was in the case of Finn Balor) that Vince thinks that only monsters can compete against 'The Beast'. That is why the likes of Braun, Joe, Kane and Roman have got title opportunities, while Bobby Lashley seems to be making it to that list soon. Despite all the hard work, Rollins is still confined to mid card.
This appears to be an insult to a wrestler of his caliber and Rollins' fans feel the same. Lesnar's exit may be the opportunity for Rollins to be back to main card, the place where he belongs.