#4 Demon Finn Balor
Degraded though he's been, Finn Balor is still presented as a huge deal when he's the Demon, squashing Baron Corbin in the incarnation's last appearance at SummerSlam. If Kenny Omega were to land on Monday nights to bolster a faltering Raw brand, a feud between him and Balor as the Demon would certainly give fans a reason to tune in to team red.
It's also a story that writes itself. It would be another battle of two former Bullet Club leaders. The Demon is also undefeated on the main roster, impressing in all his showings and being unique enough to transfer a big rub to Omega in victory at WrestleMania.
Finn Balor is reportedly set to get a renewed push, likely for the Intercontinental Championship against Dean Ambrose, but a feud with Kenny Omega would be a much bigger program, especially with the Demon in play.