The serialization of the movie "Ultraman Gaia: Battle in Hyperspace" continues with part two of three in episode #14 of "Ultraman Chronicle Z: Heroes' Odyssey":
For Dan's origin, I'm afraid you'll have to wait till episode #17.
As for Sandayu Dokumamushi's characters in Ultraman and Ultraseven, it might be useful to remember that the two shows were only retroactively set in the same universe.
That's also why the focus of Ultraseven was shifted from regular kaijus to alien invaders.
I think this was just common at the time. Maybe it was because back then studios still had exclusive contracts with actors in some countries, and/or it was still a familiar trope from theater groups.
Yes, Ultraseven was aiming for a more mature tone than the previous Ultraman or even the following few Ultra series. But the series was also very plot-driven, with most of the character focus given to Dan and/or the guest characters.
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