#2 Drew Mcintyre
WWE always keeps a contingency plan ready and it became a bit obvious when Drew McIntyre pretty much dominated Dolph Ziggler in their steel cage match and ended his feud with him.
WWE is keeping Drew McIntyre Ready for that main event push if the push with Seth Rollins doesn't get as much traction as it is supposed to (the lingering Roman Reigns factor could play a role in that).
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Even at the last minute, WWE can decide against going with Rollins and instead pick Drew who himself would be a pretty good choice and has proven himself to be more than capable in handling the main event.
Even Drew on his part, when you look at him, looks like a complete package in every which way. He's damn good in the ring and he has a charisma which is just hard to teach to anybody.