Katakuri one of Linlin’s sons will help Luffy in her further downfall. Especially if they are end up returning in elbaf
A similar situation could happen with Blackbeard and shanks but instead of their kids helping luffy it could be their captains
Blackbeard and shanks while raised by whitebeard and Roger like their own I don’t think they’ll help luffy beat them
Weevil whitebeard’s self proclaimed son helping luffy against Blackbeard just makes too much sense. Weevil himself probably being some type of scientific achievement using whitebeard’s dna
What if something similar happens with ace. The actual ace obviously still being dead but the wg using his dna with it being a big power move on their end. Turning the son of the pirate king into one of their main weapons