#1 Not ready: Finn Balor
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This really hurts to say, but its beyond obvious that Finn Balor does not belong in a main event title picture right now. In fact, with how poorly WWE has booked him since Summerslam, he wouldn't even be deserving of an Intercontinental title shot right now and is slowly losing his place on the card.
Of course, WWE tries to hide that by putting him in main event situations, but they never seem to have him come out on top in the end. WWE put him in a main event match against Reigns the night after Summerslam, which resulted in Balor taking a clean loss to Reigns. WWE followed that up with a loss to Corbin due to unfair rule changes.
In the end, WWE has done so much to erode The WWE' universe's confidence in Finn Balor that it's going to be a long time before anyone ever takes him seriously again. It will also be a long time before he ever gets another shot at The Universal title, which is going to turn a lot of fans off from WWE, but it seems to be for the best right now.