i think it would be REALLY cool if nero's possessed arm spread throughout his system so that he was completely possessed. this would make him a half demon like dante and vergil (supposing he isnt the son of dante or vergil, or long lost brother, or any other theories you guys have, because then he'd already be half demon). i think it would be a cool turn of events that made nero act more malicious, not caring about the lives of innocents and all that