hmm...not a bad thoery dude....dere is a lot of difference b/w been defeated n been killed.

Dante only killed the influence of nelo angelo upon vergil.......mundus is quite skilled in the art of recreating souls eg dantes mom (trish) n nelo angelo(vergil).....is jst theory but i guess neros arm(db) is part of nelo  angelo dat mundus created or i guess mundus did not use all of vergill soul to create nelo angelo....he might have kept part of vergil soul aside for future use.

just a theory anyway....