The timeline of Bayley still amuses me for when she started to become a contender. She started off (character persona) with poor skills and inability to focus on the match because she was just so happy to be there, and that let everyone beat her. Then she became competent in the ring and it was an amazing sight for fans, she wasn't terrible any more.
The same idea of Sasha just being at such a high level skill wise since joining the main roster (we will have to pretend of course it's better there) and Bayley still just being NXT level (again, pretending for story purposes) could work with us seeing Bayley improve overtime and getting closer and closer to victory with each match is how it could go in a nice perfect world of slow builds.
Of course it's not 1990s Japanese Women's Wrestling, so I don't expect it to happen and we just get a surprise call up, win on the first night again.