#2 Finn Balor
Although Finn Balor has spent almost two-and-a-half years on the main roster, he has never held any major or minor title there except the Universal Championship. And since returning back from the shoulder injury he sustained a few years back at SummerSlam 2016, he has stayed on sidelines.
But, honestly, I believe his time on the sidelines is over.
I think when the next Superstar Shake-Up happens (or when the brand-split comes to an end), Balor will be one of those superstars who will get drafted to SmackDown Live from Raw. This move of "The Demon King" could potentially land him into the WWE title picture.
Moreover, we could possibly see a Balor vs Styles matchup for the WWE Title. Maybe Balor could even become the WWE Champion.
Just imagine two former Bullet Club leaders squaring off against each other one more time. Honestly, the whole WWE Universe will be on their feet to see these two going against each other.