Both of them surviving this was bullshit lol
What Oda did with and to Big Mom in Wano was some of the very worst writing he has ever done. It was even worse than this abysmal wedding cake chase in WCI.
And the rest of the raid of Onigashima wasn't better with the absolute lack of tensions and stakes and all the ridiculous amount of plot armor and plot handicaps against the Beast Pirates, how the Calamities, Flying Six and Apoo and Hawkins were handled; Kin'emon and the Scabbards being suddenly able of injuring Kaido who had been hyped as nearly-indestructible, Oda has a gift for devaluating things and power levels and consistency in particular; Sanji and his awakened Vinsmoke genes, the continuation of the Zeus drama, Nika's ressurection and retcon, Yamato's antics, etc...