you dont know so you cant claim it isnt a factor, simple as that. i dont know either but i do know it takes more than a day. you basically disregarded that as irrelevant anyway so what does it matter if i cite a source? your mind is made up. Joanna wanted to fight before June 2022 as well, but that didnt materialize for reasons unknown. the lack of fans is likely not the only factor.
bottom line, Zhang has more championship experience and more title defenses, she's p4p better than Grasso who has had 1, uno, eins, o n e championship win. if Grasso defends vs Valentina then she's deserving of p4p #1.