Of the current roster, from a business perspective LA Knight makes the most sense. He has the charisma and personality to be a main eventer but he's already over 40 so if you're gonna push him he needs that quick jump up the card that only a MITB win can give you
It shouldn't be Cody. He CANNOT finish the 30 year story with a 4 minute cash-in against an injured opponent. He should win the big one properly
I'd mark the fuck out though if CM Punk comes back and wins it in his first match back. He might be too old and burned too many bridges though