#2 Samoa Joe
Keeping in line with the giant-killer aspect, WWE’s resident hitman Samoa Joe isn’t in need of the same type of treatment as Braun Strowman, as he’s a veteran in the business by this point, but he still could use a bit more legitimacy.
Over time, Joe will have his feuds with Roman Reigns, Seth Rollins, Dean Ambrose, John Cena and others, so his future shouldn’t be problematic in reaching that goal, but it would have been cool to see his style mesh with The Undertaker’s.
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In particular, the past 10 years have seen The Undertaker adapt a more MMA-based approach to his in-ring work, which could have been fantastic to watch against Joe’s style.
If only Joe had moved from TNA to WWE a few years sooner, this would have definitely been on the table at some point, similar to the situation with Sting that is sadly out of the realm of possibility even if The Undertaker were still able to go.