User blog comment:NaiflidG/Discussion on Cain (possible spoilers)/@comment-1509826-20131222180848/@comment-11331875-20131222221511

The only reason I'm not sure if the demonic and "-and Abel" Cains are the same is because, well, it's Season 9 and the writers are proving to be excellent with bad retcons and plot holes and not so much anything else. I wouldn't be surprised if they forgot the bit about Cain and Abel from TSRtS. But let's give them the benefit of the doubt. If he trained the Knights of Hell, he'd have to be older than them, so he must have been created between them and Lilith. As you said, General, he must also either be on par with them in terms of strength or potentially even stronger. (Okay, now I'm seriously hoping that he turns bad and either starts working against Abaddon to become King himself, he serves her, or she serves him. I just really want more badass demons for Sam and Dean to fight.)

So far, I'm thinking that Abaddon would serve stronger demons without complaint; it's just weaker ones bossing her around that she has a problem with. So I'd think that she'd initially be cordial and respectful towards her old master, only to get pissed off with him once she found out that he retired for love. I wish they'd go into more detail about who was controlling her in 1958 (if Larry was right about that)--was it Azazel who sent her to stop the demon curing experiments, or was it somebody else? I'd also like Abaddon to comment on other demons and archangels and stuff--is she angry that Lucifer was trapped so soon after he was freed, or does she not care? Is she happy that Michael is trapped and Raphael and Gabriel dead, or did she angry that they're out of commission because she had wanted to avenge her fallen comrades personally? What about other demons whom she would have known--Azazel, Alastair, and Lilith? Does she view them as examples of worthy demons like her, is she upset that they're dead, was one or more of them perhaps a fellow Knight and her comrade? So many questions!