The only "positive advantage" I can think of is, you at least know WHERE he is. IF said attacker is/was skilled enough to get on your six you have lost the advantage. As I think some one has already indicated SPEED might serve as a tool to shake the bad pilet off your butt and on to someone else. ...
Who says he was anywhere near "skilled enough to get on your six"? Just because he's behind you doesn't mean he got there on his own, hehe! Hopefully he
thinks he did, but that doesn't mean he's right...
The speed differential 2bighorn is referring to is his speed being
greater than your own, not yours being greater than his. If you handle the situation correctly,
and he handles it poorly, his greater speed can be used against him. If he's behind you, and you're faster than him, you don't really have a problem do you?
Even if you don't have a speed differential, you can make it appear as if you do (or at least have the same effect) by altering his angle of approach (turn, so he approaches from your side). In fact, that's how I prefer to do it myself- I like to appear slower than I am. Mechanic/Batfink has some uber laser-accurate eyeball assisted sighting system that allows him to kill people as they go by- I don't, so need to have enough speed after the overshoot to catch/kill my victim. It does me no good to have my victim overshoot me, and be so slow myself that I can't keep up with him. So I need to get the overshoot but still be at least nearly as fast as him, so he can't get away!