4: Lars Sullivan

Lars Sullivan tried and failed to dethrone Aleister Black at NXT Takeover: Chicago in June, which in itself, would provide him for a reason to want to take out the former NXT champion.
Sullivan is a reliable main-event guy in NXT, and while he may not be able to keep up with Gargano and Ciampa from a technical standpoint, his power move based arsenal would bring a different dynamic to the match and could bring out something new and interesting from the former DIY team-mates.
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Unlike a lot of names on this list, Sullivan is very much a man without any connections, and he would have no qualms treating both Ciampa and Gargano the same way.
His inclusion could even lead to a brief alliance between the two former team-mates, which is something that would no doubt get a huge pop from the Brooklyn crowd.