Idk, if this was already said, but i bought the game 2 days ago i just beat it, i loved it, everything from the cut scenes to the ominous story and hints to neros past, but after reading through a couple forum threads i was prompted to inquire about something that has been bouncing through my mind, now this is strictly spectulation and i have no evidence to back it up but what if all 3 are related (nero dante and vergil) but what if it was a divine scheme by Sparda as some sort of rebirth... bear with me now, the twins dante and vergil each have half of spardas power, ok now what if nero (possibly born of eva or another woman) took on aspects of sparda but when the three are united along with the sparda sword it somehow manifests into the rebirth of sparda him self, the devil powers of the twins reunite along with the physical manifestation on nero (whether it is accurate of sparda lore or not) along with his heart and soul that would be in the sword = rebirth
again merely speculation
plz discuss, dont be to brutal on me im new i just wanted some thoughts from others to put mine at ease