#4 Keith Lee (sets up a feud with Riddle at WWE Fastlane)
Mustafa Ali challenged Riddle for the United States Championship on the go-home episode of RAW before WWE Fastlane. Since Riddle retained his title after an untimely distraction from T-Bar, Ali might demand a rematch at the pay-per-view. If that happens, it would be the perfect opportunity to bring back Keith Lee as long as he is medically cleared for a return.
Lee was initially scheduled to face Riddle and Lashley at Elimination Chamber, but he missed the pay-per-view. Riddle walked out as the new champion, and he is currently feuding with Mustafa Ali on RAW. He could defend his title against Ali at WWE Fastlane, following which Lee would demand his shot at the US title.
Interestingly, this will also allow the creative to turn Keith Lee into a heel. Lee could attack Riddle after the match to set up their feud, leading to a WrestleMania match. As for Ali, his loss at WWE Fastlane would finally prompt RETRIBUTION members to confront their leader.