Is there a link to an article that says it is Sparda? I understand that Sparda had no human form, since he was 100% demon, not a half-breed like Dante and that the LDK costume was intended to be "Future Dante", what he might become. Also LDK costume retains Dante's voice. I would like to play as Sparda for real!
As far as I know, you don't get any other abilities