Yeah I figured Perkins would win from the final four. Ibushi won't agree to a full time contract with the WWE, Sabre hadn't been signed yet, and Metalik, while awesome, doesn't speak English. You're right that he can absolutely be a champ down the line, but you need to start out with someone who can speak the language and build himself and the belt up. A cocky heel who still wins on his own skill would be perfect for that.
No shortage of good feuds, though. All eight of the cruiserweights they're bringing in seem like they would work well together in the ring, and that's not even bringing up matches with more than two guys.
I think they could really do something with Gargano and Alexander down the road. Both of them seem like they could be actual WWE champs given the right booking and enough time.
I also wonder if the cruiserweight division will be totally insulated from the rest of the roster or if these guys will be able to work with other main roster guys and even compete for other titles.