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Not sure how on Kitano (flashback is possible I guess, or he's a crewman and went to the academy later to become an officer. But then he's know the ship and older crew members already. At least somewhat. Though they did seem comfortable having him take the combat chair and had him both pilot the ship and fire the wave motion gun.), but the Galman characters could be Gamilas orignally as most of them were not really stated to be native to Galman over Gamilas (at least in Yamato III).
Plus we don't quite know the scale of the Greater Gamilas Empire in 2199. We can guess that Galman is either the distant former homeland (lost to time) or it is a prime colony world deep in the Milky Way Galaxy. Though why they would have that is an unknown. Also the reason to attack Earth is still an unknown.
It is always possible they will change the backstory of places and people to fit into the current story, or to make potental future stories make more sense in the limited timeline. Having the Galman Wulf as a Gamilas submarine commander in 2199 makes a certain amount of sense in that by Yamato III, he was a high ranking officer with a large reputation and they have multiple high tech submarines with advanced tactics, when the rebuilt Galman-Gamilas Empire should only be a year or so old.
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