Given how Koby is pretty much written to be the Gohan of the series (Mr. Potential who randomly gets like 50x stronger with minimal training), is Koby being a top tier by EoS even that ridiculous?
Dude went from being literally below fodder to a superhuman Rokushiki user with like 1 month of training, unlocked CoO around the same time as Luffy, and recently just pulled ACoC out of his ass. I wouldn’t be surprised if he could use ACoC at will the next time we see him