Pretty much I think Rayleigh and gaban were masters in armament and observation haki respectively
We already know for a fact Rayleigh has the highest level of armament so that’s pretty much set. So maybe he’s a master of that internal version
Like having all 3 alone doesn’t mean you’ve mastered each level. From what we’ve seen each can be pushed further with things like full body hardening for basic, what kizaru does for emissions, etc. so yeah why not give ray the highest mastery of the last level. If he mastered the other 2 I wouldn’t mind either lol
Obviously we don’t really know shit about gaban besides him being one of Roger’s top men just after Rayleigh but I just think it’s fun speculation so yeah
With Rayleigh being the armament master it’d be cool if gaban was the observation haki master. Maybe knowing how to do things like future sight and observation killing and other techniques idk. Again I just think it’d be cool if Roger’s top 2 men specialized and mastered each
Roger most likely mastering both with maybe knowing some unknown rare conquerors abilities on top of that
Odens in the picture so ima mention him too
I don’t think oden had internal armament or future observation but I do think through the mastery of his swords enma and ame no habakiri. Like while oden “only” has emissions armament enma helps boost his output beyond normal kinda making up for the fact he doesn’t have internal. Imo habakiri might be tied to observation haki and his sensory abilities. So despite “only” having basic observation it can be enhanced somehow