Oden served under Roger still. Are you saying Law is serving under Luffy? Nope
Also Oden isn't a D.
Smoker isn't Garp, that's Coby or so.
Oda gave Luffy 2 Ds as rivals just like Roger had.
Also it took D
Orochi df doesn't work like Marco or Kaido.
In real mythology , phoenix doesn't heal others unlike in OP
Eastern dragon depsnr shoot boro breath like Kaido.
Orochi is dead.. Him being alive after cut like this by Kaido is the highest bad writing.
Blood, head on floor, eyes blank, he doesn't even stand up or regenerate the whole chapter till the end, and Kaido BM who have CoO don't feel that he's alive.
Kaido killing Oden with a Gun and Orochi with a sword is a great symbolism that he doesn't care about Kozuki and Kurozumi clans.
Both are just people he wanted to use for his goals.