ok i no there is alot of speculation on neros arm so heres my theory on it.

i read somewhere that nero was the Order of the sword own demon hunter of sorts, so i believe that since it is mentioned that he had not always had the arm that around the time vergil died nero some-how came into contact with him and alas, devil bringer. this would explain the connection with yamato and his DT looking suspicously like vergils, also dante says he need to keep the sword in the family and nero keeps it so maybe dante is hinting something there...

any way what is your opinions.

there is a thread that asks could nero be the son of vergil check it out

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Kill one man you are a murderer
kill one thousand you are a hero
kill them all and you are a god

seeing as it's confirmed that Vergil makes no appearance in the game (and is not referred to), both speculations are false. but don't take my word for it, go play the game.

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the order of the sword is a group of demon hunters not just nero.

although you find out thats not true pretty quick

have to even played the game? 

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"Whatever,do as you please"

dmc 4 doesn't mention  how yamoto  got out  of  hell  and it was broken so vergil is dead and nero should not even

be allowed to touch it 

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Kill one man you are a murderer
kill one thousand you are a hero
kill them all and you are a god

yea thers no way virgil wants to be in his arm. maybe hell come out and kill nero or use his body

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"Whatever,do as you please"

virgil is using nero to gain more power for his return i dont think he is in the ar but i do think he was in yamato and sensed nero had power and when nero absorbed yamato in to his arm i think virgil the went into his body. if you pay attention to what it says after he gets yamato it says nero awakened the devil in yamato

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What's your name kid?
Nero

Ilfratelli:

virgil is using nero to gain more power for his return i dont think he is in the ar but i do think he was in yamato and sensed nero had power and when nero absorbed yamato in to his arm i think virgil the went into his body. if you pay attention to what it says after he gets yamato it says nero awakened the devil in yamato

You said it backwards, it says that Yamato awakened the devil in Nero, and i think Vergil has nothing to do with Nero, no one in the order knew that Nero was a demon until Agnus saw what Nero did on his lab, and don't you guys think that Nero was born with the arm like that? Clearly one of his parents was a demon, and he got that sort of power.

 

     XXR
 

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It's on baby, it's on...