Its weird, after some observation, I began to wonder how Dante was able to use Vergil's moves when he hasn't seen for over 10 years? That goes beyond just mere watching him and copying his moves from memory. And then I remember that Vergil had grown in power by using the darkness within himself and I figured that must be true because bits of darkness would appear when his sword makes contact with something. I also had done a little research and it turns out that the name "Yamato" could be read as "demon blade." I'm starting to think that Dark Slayer is more than just a style and possibly something that emanates from the person's soul. Dante possibly learned Vergil's skills because Yamato is a physical representation of Vergil's soul and thus contains the Dark Slayer style. Or it could be the reverse and Vergil could have gained his abilities because Yamato is a sword of darkness. Any thoughts?