Forgiveness not needed, but granted (джен)

Donnie doesn't remember his second mutation, how close he came to dying. He doesn't remember the pain he caused and the people he almost hurt. He doesn't remember his brothers trying to stop him and treating him like a savage animal. He doesn't remember the deal. He only remembers waking up to the open arms and grateful smiles of his family and being cared for in his recovery.
His family remembers everything and in very vivid detail. With Donnie asleep in the lair, maybe that's why Raph finds him up here?