User blog comment:Rafe Adler/Top 10 Things I want in Supernatural Season 12/@comment-26982641-20160904081251/@comment-1975828-20160904125728

Wasn't Samael the lover of Lilith in lore?

Anyway, Mark Sheppard implied that Billie was the New Death, so, even if Samael appeared, he'd have another role.