Sure did. Luffy overcame many challenges and ultimately emerged victorious against Kaido. It was a long and hard-fought struggle that showcased Luffy's growth and determination.
Well, it's not a very common or traditional concept in the One Piece fandom. Luffy is the son of Dragon in the original story. But in the world of fanfiction, some people might explore this idea for the shock value or to create a really different take on the characters and the story's dynamics. However, it would require a lot of creative liberties to make it work within the existing One Piece lore.
It could be about creating a fictional story centered around Kaido's grandson in an original character (OC) context. Maybe it involves adventures, relationships, or battles in the world related to Kaido's universe.