One of the major differences between zoro and rayleigh is that the latter is, in contrast to his captain, quite thoughtful and reserved. Zoro on the other hand is aggressive as fuck and just as batshit crazy as Luffy. Often enough displayed by Oda (early example of zoro assaulting and fodderizing the entire along crew but also things like the murder attempt against Carlos)
Current Rayleigh's calm nature might be due to his age and retirement though. Surely he wasn't called dark king for nothing.
In short, closest to rayleigh but still quite distinctive and building his own type rather than fitting in some pattern.