Kayla being PFL's biggest homegrown star just goes to show how utterly abysmal their marketing is. Harrison, despite her double Olympic gold medalist status, is a name few outside of the hardcore circle has heard of. And this is by design: PFL's whole gimmick is we're a "pure sport" where trash talking and personalities don't earn you fights, fighting worthy opponents do.
This is the fundamental problem with PFL: they build their whole identity around being everything the UFC isn't, when love it or hate it, UFC and the matchmaking model are the proven winning formulae. So you end up with is a misguided product that is at its core incompatible with the business reality of prize fighting, with all these ideas that look great on paper, and only on paper. In reality, fans tune in for exciting personalities, not some no name who fought through 3 tough nobodies to earn a shot at the title.