....that means Coby is Ace’s son?
Roger had 2 kids
I mean the man was a classic pirate. Its completely believable that he could have knocked up a girl and not even known about it
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Coby is to inherit Garp's will. Garp is a D and hence Coby, Garp's successor, should also be a D.
It would also parallel in that Luffy, Garp's grandson, becomes Pirate king whereas Coby, Roger's grandson, becomes a marine hero.
apart from that, the new world parallels the pre-skip in some ways. This is very easily visible in dressrosa where Doffy, sabo, and fujitora all bared similarities to Crocodile, Ace, and smoker in alabasta. Similarly, I think we will get another moment that parallels the scene in marineford where it was revealed Ace was roger's son. This time with Coby.
marineford teased a conflict between Coby, Garp, and Akainu. Coby being the grandson of Roger would be the catalyst for this. If this is revealed, Akainu might try to execute Coby as he would view him as a threat, this would ultimately lead to Garp standing against akainu, dying, and ultimately paving the way for Coby to become admiral.
Lastly, Coby being Roger's grandson and by that Ace's nephew would allow Garp allow Garp to essentially do over the mistake he made in Marineford where he let Ace get executed.