Spoilers: mention his journey, discovered a lot of islands, was called the "King of the Seas" and later the "Pirateking".
Zoro fandom: He is the greatest swordsman!
Yes, cut your noise. This flashback only highlights Oden's adventure with Roger and Co. Hence this flashback does not deal with powerscaling or certain fighting styles which a certain fandom may think about it, whether you like it or not.