Bruh, Luffy is defeating a Yonko who has sustained a massive amount of damage already. That's a far cry from Big Mom, who has suffered barely a handful of attacks that caused any real significant damage. The gap between Kaido and Big Mom is not that huge. Luffy is far and above the strength of current Law and Kid, and he still hasn't even showcased his new abilities in G4, outside of one attack from Snakeman.
You really believe that Law and Kid, who are pretty much on deaths door at the moment, are going to be capable of reaching G4 + AdCoC, +AdCoA + AdCoO status, in order to beat Big Mom, with their awakening?
What kind of shit would that be? Oda puts Kaido through the ringer by 20 different characters, but relatively fresh going into the 2v1 Big Mom gets beaten by two characters, and a handful of awakening attacks?