Tbh I get his main criticism that the Oden relationship with the Scabbards wasn’t developed enough and that they shouldn’t have been the main emotional force in the arc. But how he goes from that, to saying it would be good to finally kill them after all the fake outs to make the arc 50 chapters longer

Yeah that's what I mean. He needs to just accept that the 13 chapter Oden flashback didn't sell it for him and move on lol.
I understand wanting more from them, but in an arc where they aren't even the main focus outside of Luffy's 10 member crew, 5 other Supernova, Yamato, Marco, and a slew of villains, it is what it is.
He needs to think about the fact that the villains (F6/BMP) were characterized even less and they have been infinitely made irrelevant now.
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Morj also misses the fact that villains in this series get very few flashbacks to begin with. Doflamingo's is the result of Law's own FB. Crocodile doesn't have anything. Neither does Enel. Lucci has one page. Moria has alluded history with Kaido up until Wano. Kata also has 1 page.
Hody has a decent one I guess, and BM too. Kaido's can simply happen as he loses or with a Rocks flashback soon enough. Maybe it happens with Yamato. If that's the thinking keeping you from thinking Oda having him lose, then that's clearly an going to a problem for these guys come 2-3 chapters.