This is such a forced parallel lmfao what?
Koby versus the corrupt king is a nothing burger, meanwhile Kuzan and Koby are both marines trained by Garp, share the same fighting style and more importantly, Koby is the reason Garp got captured in the first place and Kuzan's the reason the Blackbeard pirates could capture garp.
Smoker isn't anything special, the story forgot about him.
Oda doesn't give PU's out randomly, Koby is going to be doing something with his newfound strength and his only ties circle Luffy, Garp and Blackbeard currently.