Not overthinking. The dude is straight up fucking surprised that punches can damage Kaido.

What did he expect? Especially that Kidd is a brawler.

Don't tell me Kidd expected to throw the entire metal scrap he gathered around Onigashima on Kaido and expect him to die or shit.
Yes he did. That's why Killer was relieved Luffy can hit him.
 
kidd is the only one that has strength on par with luffy. there is no way kamazo and zoro, law have more strength then him

if anyone is doing damage to kaidou, it's kidd and luffy
You can't convince people that when he has not done anything significant especailly when we see Luffy's acheivements. Oda tried to hype him, but in the end no one feels that way because he acieved nothing to make us feel like that. Even if oda says he is Yonko level with no acheivements of that sort, no one will feel that way.
 
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