User blog comment:Muhammad Amir/New suggestions/@comment-5243739-20150725102220/@comment-1733689-20150725104744

It's not just that Hikaru's and Shou's minds were in sync, Victory is not a conscious Ultra he is Shou as an Ultra, meaning there is only Hikaru, Ginga, and Shou in one body. That's not the same as Saga, who had additionally Dyna's, Cosmos', and Zero's minds merge. Also Taiga, Musashi and Asuka all were shown as just being in sync, that is not the same as being part of one mind.

And even though Retsuden's website features Ginga Victory, it doesn't seem to be in the manner of a new character, more like because it's a new body not a new character.