That was a nerfed big mom to begin with plus brook specifically counters big moms homies 
Marcos healing for others is nerfed he can barely heal minor wounds for others 
Zoro is near death if not dead which chopper will heal him so he survives but to say he can rejuvenate him in minutes to be in the physical form to fight kaido is absurd 
But chopper didn't even revive zoro the first time 
The mink doctor did 
Franky mentioned a weapon to hurt kaido but he's never shown anything of the sort 
But it's possible I guess 
Nami hit big mom with Zeus but she tanked it like it was nothing 
When I say damage I mean something meaningful not just landing an attack 
Stampedes not Canon 
Sanji is strong but hurting queen is not equivalent at all to hurting kaido 
Sanji hasn't proved he has the ap to hang with those types of characters 
I'm sure he can land attacks Maybe even blitz kaido for a second 
Not taking in that he is in horrible condition right now 
But the whole point is what meaningful impact can they have in a fight with kaido that would be able to hold him off while blood lusted 
Like sure oda could just draw a moment where they stand up to him 
But to say they could fight him for even a handful of minutes is crazy 
From what we've seen 
I don't think it's disrespect at all to say that about the crew
Kaido is just that imposing 
He has an insane amount feats this arc and he keeps getting more 
I took an awakening for luffy that gives toon force esque abilities to have a shot plus like three other arc power ups 
And for the chopper thing he only could make queen laugh while using his power up 
Ussop chopper Nami robin would get smashed in a second and the rest would fall in a couple of moments 
None of them have any hax or incredible feats of strength