I haven't played DMC4. so there is a lot of things i don't know. but the whole New main character and the whole arm thing makes me wonder. what if the developers of DMC4 saw MGS series and saw how the players hated the idea of a new character. and they saw how Konami brought back Liquid in MGS 2. and thought hmm we can do something cool with those two ideas. we will mix them together so we will have a new main character and we will give him a devil arm. so one day in the future we bring vergil back.