I've thought about that as well. I can honestly say that where my anchor is located (second molar), that the arrow should always be in my secondary vision. If the arrow isn't in my split-vision it won't hit. So for me, consciously or subconsciously, if I were to look for the arrow, for a shot I knew I was going to make, I would find it. I think that's one problem I had with Asbell's books, according to him I shouldn't have been able to see the arrow. To make up for that I tried turning my head, etc. All I ever managed to do without the arrow in my split vision was to miss. I think that in Asbell's case, with his finger pointed at the target method and high anchor, he must be aware of the arrow on a subconscious level.

I have met people who anchor to their chests, and they seem to be pretty accurate with that method. I know that one of them has absolutely no idea where the arrow is in his secondary vision. He draw to the right side of his chest and is right eye dominant. So, I think it depends on where the anchor point is.