So everything starts canon in till sam remembers his past life. Now this could go many way depending on some factors the main factors being when he remembers"time like was it at the ruby arc or when he's stuck in the cage or does he just remember when he's born or when he's fed demons blood by azazel", how he remembers"if he remembers all at once or slowly or all at once, how much he remembers"did the cage trigger it or was it the demon blood reacting with the uchiha eyes or was it something else", and what he does with it. I'm honestly stuck at this point and I can't seem to decide on one of them.
Sam sobs as he's carried away by his big brother. WHY COULDN'T HE JUST DIE LIKE A NORMAL PERSON, why must he come back to life couldn't he have his eternal sleep(unknown to him nebbia, watching from her screen, cackles at his misfortune and pain). Well he has a new brother to take care of. Dean is his world now. Accepting his fate( the b**** ) he falls silent. He Closes his eyes, unknown to everyone but itachi, his eyes glow in three spinning tomoe.
Please comment if you write one of these possibilities.