#2. Samoa Joe

With The Samoan Submission Machine being #2 on the list, there is no denying that he would make an exceptional option to be the one to take the WWE Championship away from Daniel Bryan in the future.
We have yet to see an official match between himself & Daniel Bryan. On the May 29th, 2018 episode of Smackdown, Samoa Joe vs. Daniel Bryan was scheduled for the card, only for Big Cass to be added into the match, which made it into a Triple Threat bout. On June 19th, 2018, we also saw a Gauntlet Match that saw Joe & Bryan face each other - but it wasn't a proper one on one match that the wrestling world has wanted to see.
Samoa Joe has yet to have a title run whilst being on the main roster, and it's clear that WWE has prevented him from facing Bryan due to the fact that they may be saving it for a much bigger occasion. Joe's run as a heel superstar has clearly run its course, so maybe a face turn would be the best way to change him up.
We have seen Samoa Joe & Daniel Bryan involved in wars before back in Ring of Honor where the two men were having the matches of their careers. But now that they're in the WWE, the WWE Universe is in need of an official Joe vs. Bryan match with the WWE Championship on the line, as this would without a shadow of a doubt be a marquee wrestling match that could steal any show.
Seeing Joe finally win a world title in the WWE would be the icing on the cake.