This is to review what Sigma has went through near the current latest installment in the X series.
At the end of X7, Sigma was shown to have been ejected from a Building, several stories up... Not to be shown again... Then we see in X8 a Sigma entity without anything of that body? No head, or body similarities.
This is where my theory comes from. Sigma manipulated Red Alert in X7, with most fighting the Hunters. Yet we can assume that few survived. But mostly we can assume that Sigma survived (obviously, but not the point) and from then disappeared.
My theory consists of Sigma going into hiding after the X7 events, and either using remaining Red Alert members as a cult to his aid, or other members whom perhaps have been following him for years. What I mean is, looking at the inconsistency
Sigma has been the more fascinating Villain the franchise has offered yet. His technical aspects and his 'reasons' are something not fully developed upon during game story. So I'd like to do a Sigma character Recap.
Sigma was Cain's most advanced Reploid to date. The only Reploid with such complex circuitry (suggests he took a different approach with the Suffering Circuit and instead compensated with added programs and circuits to attain a similar effect). Afterward, he went on to become the Maverick Hunter Leader.
With what we know, Sigma had a fight with Zero, the Red Maverick. And after getting ruined, he was able to win by a KO blow to Zero's Forehead Crystal. Thus marking the initial sequence of his infection.
This harmed his pride as a General, and altered his perspective.
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