[quote=@Buddha]
<Snipped quote by Asura>

[url=http://naruto.wikia.com/wiki/Silent_Killing]Falls under techniques[/url].

Even though it's a style and not a jutsu, the style still has to be learned. Instead or requiring activation it would just be seen as something the character knows about. 

[/quote]

In that case, how would you rank such a skill? Or would it scale?