1. Jinbe and Mr. 2 also saved Luffy, as did many others during the Marineford War. They did not have to be a D. Since Punk Hazard and Dressrosa were the first arcs after the timeskip to add a Supernova storyline, it made sense for Law to get a unique setup beforehand, especially as he was the only one among them with a central role in that early stretch.
2. It was still after the introduction. It is entirely plausible that Kidd was originally meant to be the one who is a D, since he fit better with the established patterns of D characters.
2. It was still after the introduction. It is entirely plausible that Kidd was originally meant to be the one who is a D, since he fit better with the established patterns of D characters.
2.So you concede it wasn't Punk Hazard then.