Vast gap is overrated, in my opinion.
For me:
Sasha: A
Becky: B+
Bayley: A
Charlotte: B+
Charlotte's stock has dropped a bit and Becky is on the upswing for me.
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No I know, Charlotte's fine in the ring but with these four it isn't about like, are they 'wwe divas' good, I'm trying to think of it more like who do I actually like. I just don't find Charlotte's whole 'i'm the daughter of ric flair' gimmick interesting, it makes me tune out a bit. I'm not saying she drags matches down or anything.
For reference under Charlotte there is natalya and naomi, and then a much vaster gap and the rest of the main WWE women's roster.
I know people like Nikki here but I just don't see it at all, she seems like part of the problem.