For me it's a matter of Chookagian having legitimately proven herself to be the second-best fighter at Flyweight with her resume. She doesn't get points with the fans for her style (understandably), but she's a tough puzzle for most vets to figure out -- much less up-and-comers. An incredibly frustrating puzzle, at that. Of all the contenders who would have a chance of going tit-for-tat with Katlyn and her rangy, technical, volume-oriented kickboxing style -- I'd expect it to be someone like Fiorot who competed at the international level in sport karate, K-1, and Muay Thai and before transitioning to MMA. Even now she utilizes a very karate-esque aggressive striking style with lots of output on the feet from the outside and a diverse striking arsenal, though she's also willing to mix in takedowns lately. She doesn't have the resume or size that Chook does, but she's a little more well-rounded and way more of a finishing threat. It would have been really intriguing to see from a stylistic perspective how things played out in the striking exchanges.
The replacement is going to be a banger, no doubt. Andrade is objectively way more exciting to watch than Chookagian and will test every part of Fiorot's game. And as a fight fan I'll enjoy watching it. But she openly announced that she dedicated herself to 115. Hell, she just knocked off a contender down there in Lemos and has been talking about making another title run at SW. I don't doubt she'll be a game short-notice replacement who can easily pack the weight back on given how easily she's moved between divisions throughout her career, but what's the sense in letting Jessica potentially finish the person that the UFC is building up as the person is "next potential person to dethrone Valentina" only to fuck off back to 115? Where's the sense in that? I mean, sure, if Fiorot beats Andrade (especially finishes her) it looks that much better for building her up for that purpose, but that's a seriously risky gamble for both women and the promotion.