Big Mom the story set her up to be a bigger villain to the SHs than Kaido.
Kaido was never the SH enemy it was the Retainers and Wanos. Luffy just happened to be roped into Laws and Momos beef for that story to align.
where as BM and Luffy have had personal beef since the start of the TS, WCI set up was shit for Sanji being a punk ass little bitch but with the premonition for Luffy destroying FMI and the BM beef all in one go BM losing the way she did and not against Luffy is a cop out on Odas part and she needs to be brought backlot set up a rematch with a newly awakened Katakuri.