Most interesting! Many of the scars appear dremelled on, but are any of them inherited from the PrePro2? The one that stands out, as you look directly at it, is off to the right, in the black area but there's usually a painted metal gash, and it's within that gash.
I've also observed the ear platforms to be approx 3/8" narrower than the MR. Is it possible that someone at some point made the helmet less deep, and perhaps took the width of the helmet in to make it more narrow when regarded from the front?