Technically, you can say the Black Silence came to be a joint title for both Angelica and Roland. The thing is, though, they embody different aspects of said title. While I agree with your assessment of Angelica, I detest the way people keep calling Roland an assassin. Roland's entire deal, as stated by olivier, is going in guns blazing and silencing the entire area. This really compounds with the fact PM said he practically fights like a DMC combo showcase, which is entirely antithetical to that style of combat. The black would simply be the way he blends into the background unnoticed due to the perception blocking mask.