Some stuff I came up with after "research".
1. After being broken off from the social chain of Zeal, the Earthbounds were split up into groups and dropped to earth. One group was kept in Zeal for slavery (almost-true as shown in the Ocean Palace episode), the others lived in shame in earth (Totally true as seen throught the Zeal Episode).
2. At one point, the Earthbounds were more advances than the Zealots [Enlightened Ones]. Although part of Zeal, the Earthbounds had all the technology Zeal desired. This made up for their not being able to use magic.
3. Zealots [Enlightened Ones] and Earthbounds shared common families.
4. The Earthbound Ones under supervision of Zeal, constructed the kingdom.
Discuss.
Where the hell did most of that stuff come from. For all we know, Zeal did the Earthbound ones a "favour" by making them work on the Ocean Palace, hence they get recognition.
And what the hell do you mean by "dropped to Earth". It is unknown what has been going on. From what we know of Queen Zeal, she was responsible for harnessing magic for everyone to use, so magic may not have been usable earlier than that. Everyone may have been living on Earth, but Zeal owned the kingdom and hence it was called the Kingdom of Zeal. When she attempted to harness magic, she may have used the sunstone. But when Lavos took over, it seems that she grew wearly of the Earthbound ones, and then they were cast off down because they could not use magic (maybe they don't have the gene that lets them channal Lavos' energy etc.) Though, Zeal's family, Dalton and the Guru's seem to have advanced magic, which may mean that some people could have had magic earlier than that, and that they all lived together, but the Earthbound ones were still shunned.
2. At one point, the Earthbounds were more advances than the Zealots [Enlightened Ones]. Although part of Zeal, the Earthbounds had all the technology Zeal desired. This made up for their not being able to use magic.
3. Zealots [Enlightened Ones] and Earthbounds shared common families.
I don't get the Earthbound ones being more advanced...
And how do you know they shared common families. If that was true, Janus would have been cast down as an Earthbound one, but because one or more of his family members can do magic, that may be why he was able to stay in Zeal. It is plausible that maybe Zealian's who can use magic that have kids who can't have magic make those kids use Lavos' channaled energy instead.. who knows.