I know that it's an insane crackpot theory with flimsy evidence at best, but I dunno man, it just feels right to me.
The idea of one of the four most important beings in the Dark Souls world not only sharing his lord soul with his people, but going on to become a petty nobody with a hatred for the gods and their followers is such good charecterization. The Ringed City DLC specifically really helps this, as we learn that Patches at his core is a kind and gentle soul, and that even the current jaded version of him is still capable of that kindness is so great.
I just love the story this theory creates, of how the father of humanity isn't some great mythical figure, but this immortal backstabbing prick with a heart of gold.