#4 Tomasso Ciampa
The former #DIY member shocked the world when he turned heel on his partner, Johnny Gargano at NXT Takeover: Chicago. After losing the match to Authors of Pain, Ciampa took his frustration out on his partner, blaming him for the loss while the crowd shook their heads in disbelief. The duo was a very popular tag team, known for their excellent chemistry and their capability to deliver amazing matches.
Ciampa was injured going into the Takeover match, but he still competed in Chicago. His injury has sidelined him till March 2018.
Ciampa vs Gargano is bound to happen when the former returns. WWE can even move the two competitors to 205 Live and let them tear each other apart, thus spicing the stale Cruiserweight division.