#2 Kairi Sane
Kairi Sane is one of the best female wrestlers on the planet, period. Unfortunately, her biggest weakness is that she doesn't speak English fluently and we've seen with quite a few Japanese superstars that not speaking good English can affect them and their perception.
The problem that the main roster faces in this regard is that they don't protect the superstars' promo weakness. NXT does this well. They did it with Shinsuke Nakamura, Asuka and even Kairi Sane (and they'll likely do the same with Io Shirai).
A former WWE writer just went after JBL for his comments HERE
With that said, she has a great gimmick and is probably the purest babyface in WWE. She can be a great role model for the young female demographic and could even push good merchandise sales.
Kairi Sane's main roster run will either be a hit or flop. It's going to be interesting to see because there are few women on the roster who are of her calibre in the ring.