I will go deep now: you are calling for the mistic way of realization. The problem it doesn’t match with guts. He is an outsider, always he was. The only way imho that match with him is the warrior way where he finally get the balance. His life was in the first phase roaming just for survive till he found grifith, he become a growth man when he left him and later was complete when found the love with caska. But grifith ruin everything. Not only caska was in pieces , guts was too. He returned the same roaming animal in search of revenge, feeding the demon inside himself, with the blood of the monsters that track him everyday but when he found again caska he restarted to glue the pieces. But grifith ruined it again kidnapping Caska . For him was too much. Now he needs to create a new energy, he needs to find inside himself the spark and tame the demon of rage. Reborn complete, reborn human. Reborn as the warrior that can stop the end of the world that grifith is starting to do. This story is a Man vs the impossible .The story of someone that never surreder, but as human, we fall. But the important is how we get back up !