I mean Kid had one of the best durability/endurance feats in wano bro. He took a lot of beat down by Big Mom strongest moves one after another yet he always stand up. I mean it is not like Big Mom ap is trash, her non CoA fists almost killed Capone off in his Big Father form.
I'm legit shocked thought, Kid getting one shotet like this is insane hype for Shanks. Kid endurance was on point in wano, probably in top 3 alongside with Luffy and Zoro, yet same dude was legit down after one attack by Shanks.
I think he is a top tier, alone as 3B character, the thing is not that Kid is weak, it is that Shanks is that op...
But im sure a Admiral or another Yonkou wouldn't get one shot like this(assuming Shanks used mid/higher end move).
They should be at least able to tank few of these attacks.