Great connections man, have to admit I didn’t think about the light/dark sword duo and the Yasu connection. I think Zoro in general has a much darker personality than is normal for the Straw Hats, the only other one being Robin (and we all know why that happened). Unlike Zoro, Oden doesn’t seem to have experienced any significant tragedies in his early life, and due to his status as the future daimyo, he was always allowed a lot of free reign. Zoro had no such pedigree and had to work his way up as a bounty hunter.
Zoro’s awakening as a swordsman was also a lot more brutal than Oden’s - his self confidence took a brutal beating from Mihawk and he learned BOAT under extreme stress after being cut to ribbons by Mr 1. Similarly Wano’s opening is going to be borne out of conflict and brutal struggle. In that sense Zoro and Momo are the perfect duo to open Wano up to the rest of the world.