tbh, almost everything about Aramaki just points to him being a Sanji opponent for me. He was introduced talking about how he'd only ate if a pretty lady fed him, he has some sort of tragic past with women, he exaggerates and act's goofy like a bunch of Sanji's past opponents.
For Zoro, I think him fighting Kizaru has always been likely. Kizaru's clashed with two right hand men so far(Marco, Rayleigh), and he almost killed him back in SA. I don't think they'll fight in Egghead though.
Issho also seems to be coded as a swordsman, but I think he'll betray the WG before the Final War. He could clash against Zoro though.
I don't really want Z&S to fight admirals(I think Issho vs Aramaki would be really cool if it happened as their final fights), but it seems like it will happen.