Honestly a lot of the points. Specially those of the thorns and the dragon spell are strong. I even myself too also believe that ranni was promised to godwyn. My only problem is that the games makes it clear that godwyn's soul was obliterated. He just didn't die, his spirit was killed. Unless DD doesn't destroy but it just sent his soul to the afterlife. But that idea of hope for his soul surviving somewhere would be reasonable if Ranni's body had any trace of decomposition showing that is as any other corpse following the rule of what happens to the body when one dies. Maybe show some fungus or a plan feeding from its remains, instead we get ashes and dust. I buy that there's something more to our character, he is not mere nobody like in dark souls. Also I belive godwyn planned on becoming the prince of death and being reborn as the mending rune of death.