Remember the last time we saw Kid and Law vs Big Mom, Kid and Law based on their facial expression were still struggling against her meanwhile Big Mom was smiling and having fun.
They already used their awakening against her and even if they use another power up, I'm still not too sure if it will be enough to defeat her.
Big Mom as far as we know still hasn't used her advanced CoC or even her awakening yet, and based on the spoilers it seems like she even temporarily defeated them before they got back up again.
I think there is a good possibility that Kid and Law's victory over Big Mom is not defeating her but removing her from Onigashima.
Also like I said before, I have a hard time seeing Kid and Law defeat a Yonko before Luffy.
I know there are some people here that are on the side of Big Mom being defeated in this arc and I'm one of those people, but you just can't deny the possibility of her not being defeated in this arc.
Also imo if Big Mom gets defeated that quickly and she doesn't use her advanced CoC or doesn't even show her awakening, then that's fucking dumb and her defeat would be bs.
If Big Mom is going to get defeated, I want to see more chapters of the fight against her and I want to see her get a proper defeat.