Respectfully, no -- I don't see that the middle one is lower -- all three look exactly the same height to me in all honesty, in that photo. And to me, in this photo, there is clearly a middle prong, so I'm confused how one can say there isn't. But the thing is, even if I do grant that the outer two are taller, the height difference is negligible in the sense that, it is so little that the middle prong would still leave a slight indentation; the outer two would obviously leave a deeper indentation. The middle prong had to be removed, like the experts say.
But again, I just don't think it makes sense to use this track to test if she was alive; nor in the spots where it was used -- in the same sense I don't think it makes sense that a stun gun was used. For example, if the track was used to test if she was still alive, you wouldn't have just two (four total) one-time jabs, in two spots of the body that were far away from each other. You would probably have two (four total) in close proximity to one another; like multiple jabs in the thigh or the shoulder. It makes little sense to me to test if someone is alive by jamming them so close to the throat, and so close to the carotid artery to boot; then flipping her over and jamming her in the back. I believe that these markings weren't made consecutively.
I almost feel like the marks on her neck, were from the strangulation in some way.
Also, if you look at this photo, the lines of the wounds don't completely mirror the parallel lines with the two outer prongs....the prongs go slightly right of both the lines and the two dot-wounds. I suppose you can chalk that up to the flexibility of the skin, etc. -- just making an observation.