Here is how i see it
Kaido wants a son
Kaido respects Oden
Yamato is a girl
Kaido doesn't want a girl
Yamato identifies as Oden thus identifying herself as himself thus being a man thus being a son
Kaido now has a son and someone that looks up to Oden, the warrior he respects
However Yamato is rebellious wheres Kaido would prefer Yamato to be obedient
If Yamato was obedient Kaido would relish the fact he now has a son and someone that looks up to Oden
Kaido puts cuffs on Yamato to control him while respecting the fact Yamato identifies as Oden but still wants control over him
So yeah, i don't think Kaido has a problem at all with Yamato wanting to be Oden, problem is Yamato not being obedient
Kaido wants a son
Kaido respects Oden
Yamato is a girl
Kaido doesn't want a girl
Yamato identifies as Oden thus identifying herself as himself thus being a man thus being a son
Kaido now has a son and someone that looks up to Oden, the warrior he respects
However Yamato is rebellious wheres Kaido would prefer Yamato to be obedient
If Yamato was obedient Kaido would relish the fact he now has a son and someone that looks up to Oden
Kaido puts cuffs on Yamato to control him while respecting the fact Yamato identifies as Oden but still wants control over him
So yeah, i don't think Kaido has a problem at all with Yamato wanting to be Oden, problem is Yamato not being obedient