#2 Bobby Lashley hasn't faced Roman Reigns since 2018
One possible challenger to Roman Reigns isn't even currently on the same brand as he is.
There have been rumors being reported lately that there may possibly be some roster moves being made for RAW and Smackdown in the near future.
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If that were to be the case, one name that could make some noise with a brand jump is the current WWE Champion, Bobby Lashley.
Lashley has had a great run as champion of the red brand. He has also let it be known on multiple occasions that he desires a match with Brock Lesnar.
If that match against Lesnar is not on the cards, perhaps the next biggest moneymaker will be a feud with Roman Reigns.
A Reigns/Lashley match is one we haven't seen since 2018, and both men are in entirely different places in their careers right now compared to then.
The All Mighty taking on the Head of the Table would be interesting, and Lashley has already proven he is capable of carrying a brand’s championship.