I think normally kelsey is not that that unctouchable but she is having the best season of her career.
I mean as a receiver she is even better than Gabi, I dare to say that she is better than a lot of top liberos. And offensively yes, this season has been her breakthrough year. I put her next to Gabi just because of this season's performance.
Who else? Maybe bosetti whose attacking performance is not comparable, or Cazaute but she recently become a starter in her club so it is too early to make bold statements.