It brings another problem that we didn't really know Oden prior to this flashback.
Maybe this is just me and because I read OP with a microscope but I feel like I've known Oden for years.
This is not meant to thwart anyone but it's how Oden has been constructed in my mind over the years.
-Kinnemon is a nut, but he's also a demon with a sword. Anytime you think back on what Kinnemon did, you knew he was doing it for Kaido, that Momo probably wasn't his kid, and everything 4e did, he did out of respect for Momo's dad, that builds Oden. Ftr, even though I didn't know his name, I assumed Kinnemon was acting on behalf of Momo' father from around 701.
-With the above in mind, this changes how one reads the bit about Kinnemon avenging for a father by killing the dragon. This further suggests that Momo's father died wrongly at the hands of a dragon.
-When we learned about the Zou-Wano connection, we learned that Dogstorm and Catviper were also doing everything, including risking their dukedom, for the sake of the family of a man they believe in. This also builds-up Oden and Dogstorm and Catviper are equivalent to one of Kaido's top three, which we could determine was a trio thanks to that Oda interview.
-When we got he quote from Oden at the time of his death, this showed us that regardless of what else we knew about his personality, he faced death without fear.
-In looking back on 701 (or 702 was it?) we also learned that Momo was probably utilized in part of his death by being threatened and taken to the sky by Kaido in a traumatic experience.
-We also learned that Kaido looked down on hi and thought him a fool. So obviously he had blindspots or weaknesses.
-The above-mentioned bit about Ashura further tells us what a beast Oden was in battle.
-We learn that his swords injured Kaido. We also know that Kaido has lost before.
All before his story unfolding in Kinnemon's flashback.
This entire time we've been learning about the dude albeit slowly, and the only thing Oda did this arc was give him a face. So, I've never gotten the impression thav we just met him or I don't know him. But that's me.
does it work if you think Oden is not a smart dude?
Oden? Nope. The people around him? Yup.