You're the one trollin' in all capital letters. So once again, I'll put in my two cents in the whole theory:
Nero is 'not' directly related to Dante. He has the blood of Sparda due to the Devil Bringer and its symbiotic reaction to the Devil Bringer. Thus, it is the Devil Bringer that gives him his supernatural powers and strength. It was never stated that Nero was a clone of either Dante or Vergil. His similar appearance to the twins is a mere coincidence. To go off-topic for a bit, it would be like sayin' Shadow was Sonic's brother because they look so much alike, yet they are two completely different beings but look at each other as if it were looking at a mirror. Nor was it stated that Nero is a half-demon or any of the sort. If any similarities at all, it's most likely pointing to Vergil. Because of Vergil's high demand, the developers gave Nero the Yamato Devil Arm. Also, notice that in the earliest trailers that the Devil Bringer originally had a yellow-orange flare, but was changed to blue later on. To negate that Nero is directly related to either brother, Nero was not, I repeat, was not born with the Devil Bringer. He gains it prior to the game, but Capcom has made it obvious he was not born with it, due to Kyrie's reaction when she first saw it. The Devil Bringer was one of the many experiments based around the Yamato blade. If this Devil Bringer was created through a remnant of Nelo Angelo, then this might explain as to why the Yamato reacts positively to the Devil Bringer. In any case, just about everything should be pointing to Vergil instead of Dante, due to the 'voice' that Nero hears, which desires more power.
But once again, I negate the theory that he is related to Dante because he was not born with the Devil Bringer
That's just my two cents on the whole thing