If you look at this by a purely objective point of view, being a pawn to him or not wouldn't matter, as long as you also get to achieve your goal. He may know more than us, but it's undeniable that Vincent still has an interest in you, and in a sense, is more willing to speak to you than to Break.

[He nods.] I have. We spoke then, actually, and she did advise me caution when I mentioned knowing you.