I think talking about a dot confuses the issue, at least it does for me. In real life, we have one of two things: either we have a bulls eye or we have a kill zone. That's what we want to hit and that's what we focus on, all the time we are aiming.
When we gap shoot, there is a secondary point, which is either above, below, or dead on the mark we want to hit. I have seen in illustrations by Byron Ferguson, Jimmy Blackmon, and others, where a dot might be placed on this secondary point, but it doesn't exist in real life. What we do when we gap shoot is to focus on the target we want to hit, but be aware of the out-of-focus arrow point in our peripheral vision. Without bringing the arrow point into focus, and without shifting our primary focus away from the mark we want to hit, we place the arrow tip either above, below, or on the mark we want to hit. The distance we place the arrow tip above or below the mark we want to hit is called the gap. If we place the arrow tip on the mark, it is called point-on. Actually, when I shoot gap, I'm not even paying any attention to the specific point that's underneath the point of my arrow: it could be the sky or a tangle of bushes. What I am paying attention to is the gap between what I want to hit and the point of my arrow.