I think KK amd Kayleigh may be roughly equal as players, but KK's experience with the program gives her a big edge on starting this year. KK finally gets to spend almost all of her minutes as the point, despite being used off the ball quite a bit her first two years due to Nika, Kaitlin, and Paige. She should be better there.
Kayleigh I view mostly as a point, but also a little bit of a 1/2. that opens up the possibility of her getting KK's backup minutes plus some at the 2. The challenge there for Kayleigh is Azzi should get big minutes at the 2, Ash is already a very proven excellent backup for her, and Allie is a talented threat as well.
Kayleigh getting big minutes, if she does not beat out KK IMO depends on a strong commitment to small ball. I think your ultimate starting lineup is among the possibilities with Kayleigh as the 5th starter, but I would rate Blanca and Ashlynn as a little more likely. I probably view Blanca as more of a 3 than you do, but I see her as the mostly likely 5th starter. I think her talent level is way beyond Ashlynn or Kayleigh, in my book she is a natural 3, and from a rebounding and defensive standpoint, her at the 3 is a better option than any of the guards.
Both Azzi and Kayleigh are mediocre at best at rebounding, even for a guard. At the 3 they would be significantly below average. Ashlynn is better than those two, but would still be over-matched on the boards at the 3. Nobody among this year's guards can even come close to the rebounding, blocked shots and defense provided by Paige last year at the 3. As a result using one of the natural guards at the 3 this year, is not just going small, it is going much smaller than last year.
In the event Kayleigh does beat out KK at the point (possible but not probable IMO), I think KK's chances of being the 5th starter are pretty slim, probably less that Kayleigh's if the starters were reversed. She isn't an off guard or a 3, and if Kayleigh starts at the 1 the decision will be who starts at the 3, Blanca or Ashlynn, with Azzi at the 2.
Others of course could take a big leap or surprise since we have far more very talented players, but Sarah, Azzi and Serah seem like a lock and we know either KK or Kayleigh will get the start at the point, and Blanca, Ashlynn and Kayleigh look like the most likely candidates for the last spot.