User blog comment:Hawkinz340/Chapter 713-Usoland!!!/@comment-178.128.26.7-20130703154145/@comment-80.137.133.120-20130704010520

Some admiral-origin guessing:

As the new Admirals are supposed to be no pre-timeskip Vice-Admirals (or even lower-ranked marines) hidden anywhere, they clearly have to come from somewhere else. I don't think, that men with powers like Fujitora's walks through the world, waiting to be chosen, so as they probably wasn't some (prisoned) pirates, he could have been member of an army. It would be possible, that is was one of the many unmentioned Grand-Line-kingdoms, but I think, he could also come from the Red Line. Of course, not much is revealed of the things happening on the continent, but I presume, that it's more than a single wall in the sea with a single city on it. As a worthy counterpart for the Grand Line, it has to have own wars and therefore own armies (not influencing the story, of course). So maybe Commander-in-Chief Kong, as leader of the entire world's military, could have send two of the continental army's generals (or whatever) to support the marine handling the situation on the New World as there were no marines adequate for an admiral's position.