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The idea of them having a space ship mutated them into WoW Draenei.
may blizzard have mercy on our souls
lol no, you have it opposite.
the ones that went on the spaceship are the original, the ones in wc3 (they also have them in WoW) are called the broken (mediumly corrupted) and the lost ones (unsaveable)
during the war against the orcs, the demons they had became to corrupt the draenei for every one they fought with fel magic, and resulted in these.

WoWWiki said:About 21,000 years ago, Sargeras, the Destroyer of Worlds, approached the eredar race, telling them that he was impressed by their work. He offered the three leaders of the eredar — Archimonde, Kil'jaeden, and Velen — untold power in exchange for their loyalty. Soon after, Velen then had a vision dictating the creation of the Burning Legion and its aftermath. He warned Kil'jaeden and Archimonde about this but they did not heed his warning. Instead, hungry for the power they could gain, they accepted Sargeras' offer. Many willing eredar were transformed, but a faction of uncorrupted Eredar led by Velen fled their homeworld of Argus, calling themselves the "draenei" ("the Exiled Ones")."
Okey
I really hate WoW for some stuff though... Why did they have Illidan killed (again?)?
Off-topic:
What happens to Illidan after Arthas slices his gut open?
