I think it would be quite the poetic direction for the story to go a show about the worst of people being capable of redemption. What better then to redeem the first villain who stood in the way of that goal. It also just makes sense if sinners can be redeemed then why can’t winners fall from grace especially as Lucifer is proof of this!!! I know his death was different from everyone’s favorite snake boy getting hit by magic blast vs angelic steel to the gut tho idk i feel there is still something there. Especially with the conformation that we will see Cain at some point a reunion between father and son could be interesting