Sure, at this point, I'm content that there's at least been an equal amount of spotlight on Koichi as there has been for Josuke, and comparatively little for Jotaro.
Though, there's the guy with The Hand whose name I still forget because he hasn't really done much as of yet. There's been a lot of talk about how much of an idiot he supposedly is in this thread (with a reference to that in the recent episode), but I can't say there's been much evidence to this in the show itself so far other than his brother and Josuke constantly going "You're an idiot" as a basic insult, and a mistake he made in his battle against Josuke.