Coby really just needs to have an CoC awakening and he could become a low top tier in some months. Dude is going through some stuff, which is great for his character growth -> heightened CoC potency. Perhaps he can use Ryou or barrier CoA already, Oda said he has insane CoO, he can use Rokushiki.
If he can use Ryou and gets a CoC awakening Oda is so going to make him a advCoC user in no time. From then on he just has to mature into stronger stats and get character growth.. Rokushiki using 1026 base Luffy incoming
And I don't know why I've never noticed that, but Garp is basically the Marines' joyboy or Marine Luffy. Always laughing, carefree as fuck. He's going to have Sky splitter+ CoC for sure, similar to drunk Kaido.
And more and more I'm getting convinced that there's an advanced tech to CoC coating: 1. normal (smaller trails) 2. gigantic trails.
Roger'S Kamusari and Garp's Galaxy Impact seem faaar too powerful tbh