As expected, Oden was just a Kanjuro's creation. I wouldn't say this contradicts his powers though considering he never needed to create talking drawings prior to his clone and it was apparent he was pretending to be far less skilled than he actually was when pretending to be a Kozuki ally. It's expected that Orochi would still be alive with him being related to Kanjuro (and allowing a character to die from realistic injuries isn't in Oda's style
2) though it's still contrived when it lacked any real foreshadowing and there doesn't seem to be any real way Kanjuro would anticipate Kaido's actions.
Also, it seems Momonosuke has Kenbunshoku Haki out of nowhere that was only given prior build up in a guidebook. Having it isn't bad, though him developing it at such a high level when being actively protected from the battles going on is. When Coby activated his in an intense battlefield, at least he was actually taking part in the battle and had significant combat experience through Rokushiki. It's not as though young non-combatants haven't awakened it prior such as the Skypiean girl, though Momo having done so just like that is still a pretty egregious way to introduce this plot point.
As has already been said, Kaido's hybrid form is underwhelming in appearance, especially compared to prior Zoans such as Lucci, though Kaido in general has been underwhelming throughout the entire arc.