Who ever complained about Luffy's dad and granddad LOL? The joyboy thing, yes, but not because he is being set up to be the next joyboy, but because of the whole prophecy thing that sets him to tbe the "chosen one", wich is quite frankly, a pretty boring narative device.
Ohhh, wooow, dumb me, who didnt see Zoro vs Ryuma and how Ryuma gave him his sword,
dumb me who didnt saw Zoro's teacher is a Wano escapee and he trained him, dumb me who did not read the current chapter's title "as peas ina pod".
Oh, I need to see a psychologist, I must be forgetting what the story is telling us.
Kaido said: You too, could not be a JoyBoy
Hyogoro said: Zoro bringing back shusui is fate, and how Gyukimaru said when Shusui left Wano, it destroyed our nation. Hence, a prophecy that if Shusui is back, Wano will be restored.
And "Two peas in a pod", literally saying Zoro is a Ryuma reincarnate.