I never played X-wing Alliance where Emon & co. show up but, from my understanding, isn't he a solidly Rebellion aligned individual? In which case, shouldn't he show up as a Rebel? Dash has less in the way of blatant Rebellion combat action yet he's a Rebel.
From a practical point of view I can see FFG saying Emon would end up giving the Rebels a Firespray so "scumming" him preserves the faction identities much better. Also, Dash's YT is in keeping with the large ship themes of giving Rebels YTs but still. Ace actually joins the Rebellion after all.
Note that I'm not actually bothered. Just curious. Does this mean Scum has some catch all flexibility going on that could see it hosting ships/people arguably aligned with other factions?