Actually, Raptors have very little to do with the VIII Legion. That was more Sahaalian exaggeration, based on rules that appeared briefly 2 editions ago (which didn't reflect the fluff very well), rather than established background lore. Night Lords use Raptors more than other Legions, but they're still rare. It's one of those misconceptions that a lot of NL players actually resent: these guys aren't the spiky Raven Guard or horned White Scars. Yes, they can infiltrate, and yeah, they use surprise attacks, but they're terrorists renowned for instilling fear and using overwhelming force; they're not the Fast Attack Choice Chaos Marines.
Bear in mind, there were only 50 guys from a single company in Soul Hunter. It would be huuuuugely unlikely they had Raptor support; it's another slice of evidence showing what little resources they had.
One of the main characters in the rest of the series, however, is a Raptor, and leads a Raptor pack. He's called Lucoryphus of the Bleeding Eyes.
Это по поводу якобы "засилия" рапторов в легионе.