You don’t sound stupid at all!
I’m really horrible at explaining things so stay with me here.
Dean = Cain
Sam = Abel
Castiel = Colette
Crowley = Abaddon
Same story, different people.
supernaturalapocalypse has an awesome gifset [x] that displays it nicely.
Oh, and this is another one my favorite Cas/Colette/Dean/Cain posts [x] by dubiousculturalartifact
Basically, Cain was saved from the blood lust of the Mark of Cain by the romantic love from Colette. So, if Castiel is written to be a parallel to Colette we can assume the same for him and Dean. Whether that will be explicitly shown is to be determined.
Still pretty exciting! :)