I LOVED AoA. Have every issue but X-Man #1 (but I've got the gold collection of that to compensate)
Nick, you have Stryfe's Strike File? It was a one-shot that came at the tail-end of The Executioner's Song. It was basically a bunch of files on miscellaneous mutants. It gave a clue that Illyana (Colossus' little sister, otherwise known at one point as Magik, from the New Mutants) would soon die of the Legacy Virus.
ANYWAY, that comic perpetually confused me. Holocaust IS IN THAT ISSUE. Very little was told about him, and I can only remember that it was about how much of a mystery he was.
And according to AoA, Holocaust was formally Unus, the Untouchable. Real asshole, that guy. The only comic I've seen him in this side of the universe was a early-to-mid 90's Marvel Holiday Special. Not sure what year, but Ghost Rider saved a blind kid, Franklin Richards had his own story, there were lyrics to "Rogue" (to the tune of "Vogue"), etc., etc...
And now you know.
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Let's keep this one alive! I love this topic!