#2 Kalisto
Like Sin Cara, Kalisto should have been part of the cruiserweight division from the beginning, but for some unknown reason, WWE decided to have him pursue the US title instead.
He has one of the most exciting arsenals in all of WWE, and against someone of similar size, he could put on quite the entertaining match. He has been able to have good bouts against guys twice his size, so just imagine what he is capable of against someone who can do the same things he can.
Having already been a champion in the WWE, Kalisto would have an edge over the majority of the 205 Live roster. He would be one of the biggest stars in the division from the moment he made the transition.
WWE already moved him to Raw during the draft, so there is no logical reason not to add him to the cruiserweight division.