I can see where you're coming from with most of these.
The Sasha point is understandable, I've always felt like she had the tools to be a bright star, though I've never personally been amazed by her. The look, presence and swagger is there, but it feels like there is something missing so you may be on to something.
I do think Asuka is a phenomenal talent though, and could truly be transcendent in a perfect scenario.
Bliss I don't think is underrated, but I guess it depends where on the internet you're looking. No denying that she is one of the best on the mic in WWE. She has that ability to present her character as incredibly believable and has proven an ability to improvise, which a lot of lesser talents are lacking. She can wrestle, though I wouldn't say she's as good as she could be in that regard. She definitely is a level or two below your Asukas, Charlottes, Sashas and Shirais.
Big Rollins fan personally. I would have him likely in my top 20 as far as in ring wrestlers in the Western world are concerned right now. He's definitely got an excellent energy and work ethic, and is capable of being a sympathetic/fiery babyface or a dastardly heel. He has some bad habits that sometimes give me pause about calling him best in the world, like the need to get all his signature moves in, even when they aren't called for (which is a WWE-wide problem) and some, at times, questionable selling. But yeah, probably top 20 for me. Top 5 WWE main roster quite possibly.