What are the interesting SBS of One Piece?

Mu Ye, who suddenly appeared in the first issue, was holding a child, which should be the son of a female bar owner in Windmill Town. Prior to this, Oda hinted at "that person's" in the forum, and many fans guessed who "that person" was, because the main characters in windmill town were all red-haired, except Luffy, how could Luffy have children at the age of windmill town at that time, so the children were probably red-haired. In a scene long ago, Luffy defeated Ming Ge, and the reward rose to 500 million. At that time, the red hair on the island was attending the wedding. He looked like a groom. He was very happy and gratified to see Luffy's reward notice. Could it be with Mu Ye?