Theories for TV Series
Dorako is a cyborg.
His weird translucent wings appear to be made out of some kind of energy and his weird hook hands look metallic. The reason he looks different after getting resurrected by Geronimon is because the process regenerated his complete organic body without the artificial parts. Zaragas is a prototype Choju.
The way it appears from a puff of red smoke is reminiscent of the interdimensional travel Choju use when they appear on Earth, while the inorganic-looking tubes underneath its shell suggests it to be some kind of cyborg. All of this makes it likely that Zaragas was a bioweapon Yapool deployed as preliminary forces for his invasion a few years later, with its Adaptive Ability being a means to gauge how fortified Earth is.Theories for Manga
The Star Cluster Alliance is really a Legion of Doom
Its membership consists primarily of species who were enemies of the Ultramen throughout the Showa Era, the Council fed propaganda to the Science Patrol about the Ultras being dangerous Knight Templars and lied about the Land of Light being destroyed while secretly waging a war against the Ultras. Jack is the son of Hayata and Anne Mohiam.
The 22nd episode of the original series, Overthrow the Surface, ends with Hayata going on a trip to Paris with the French Science Patrol Agent Anne Mohiam after rescuing her from the Underground People. It's entirely possible the two of them slept together, which would explain why Jack (Jacques?) Has the Ultra Factor and appears to be at least part white. His origins may have been hushed up to avoid compromising Hayata's position as defense minister, though given the loss of his memories of the time he was with Ultraman it's unlikely he himself was even aware of the affair. The Manga timeline has the original series set in the 1960s, the Anime timeline has it set in the 1990s.
This mostly has to do with the differences in the backstories of Rena and her father: in the manga Yosuke Endo was a child during Ultraman's time on Earth and idolized the Giant of Light, while in the anime he was an adult and married with a child, and was implied to have lost his wife during Ultraman's battle against Zetton. Since it would logically be impossible for Rena to be a baby in 1967 and a teenager in 2019. It makes more sense when you consider that Ultraman was originally going to take place 20 Minutes into the Future but this detail was largely unused in the show and quietly ignored in later seasons of the Ultra Series. The Star Cluster Council was only exaggerating the Ultras' tendencies to go Knight Templar.
The Ultras do occasionally slip into extremism, but it's not as common as the Star Cluster Council would have the galaxy believe-it was only a few isolated incidents that wrecked their reputations for a long time afterward. More than that, the Ultras are fully aware of this, and they merge with people (like how Ultraman merged with Hayata) specifically to keep themselves in check.- That could also provide a reason why Bemular was far more brutal with Hayata in the anime: he's possessing something that isn't alive, and he's been on the run from the Alliance for years-and with no one to keep him in check, his moral compass has gone astray and he's lapsed into the extremism they're so afraid of.
