User blog comment:Staw-Hat Luffy/If Sabo is dead who did Dragon save?/@comment-1739368-20130326030841

It's highly insinuated that he saved someone, as Ivankov said that they needed to tend to someone's injuries as soon as Dragon was aboard. Highly doubt it was Dragon himself; aside from the fact that he was wearing a long cloak, he mentions to Ivankov that he specifically did not bring him to the Celestial Dragon event as to not attract attention. I doubt anyone who simply went to "watch" and "not attract attention" somehow got into a fight, involving someone like Dragon's level to get severely injured.

As to who it is, as some guy mentioned on a youtube video, it must have been some dying weasel  he found on the road.