Keaton;78399 said:
IIRC Nero says 'this arm was made...' so it makes me wonder if he has had it..or atleast a version of it, for as long as he can remember. I wonder also how he turned up at Credo/Kyrie's, after all he was adoped by the family, and he couldnt have had the DB as a child otherwise someone would have seen it when bathing him or when he wore a t-shirt.
Maybe he just woke there, no memory of being anywhere else...hiding the DB when he discovered it under his shirt.
Well, It is mentioned that Nero did the Order's dirty works, and he hasn't stayed a lot with Kyrie and Credo, or someone that could notice It.
Although one scene I can't understand, is that when Dante comes from the glass ceiling into the Opera House, the prologue, Nero's arm began to glow. He then removed the sling, and then all saw his arm. I mean, Credo ordered him to take on Dante, until more troops could arrive. It is kind of strange.
Also, the hovering ghost behind Nero, is Vergil's endoskeletal DT form, or in other words, Vergil's DT without the armor. The arm of the ghost and the Devil Bringer are the same.
Agnus said that the Yamato was used by Sparda to seal the 'true gate', so I think, in base of my theory, that the fact of Nero being Sparda, has awakened itself with the Yamato sword, and It's normal, because Nero lives in Fortuna.