Sorry, mate. I am being dense here. You know well how many discussions we have had here over flash vs. non-flash, and AFAIU, there is no clarity. No consensus. Is there? Hence my strong interest (apart from being a brachy fan).
One point that confuses me is the use of the word "background" w.r.t. coloration. IDK with 100% surety which one should be considered the "base", or "background" color and which color would then stripes be. Considering strictly, the head is dark, so I think the dark color should be thought of as the base=background color. Hence, the stripes are of the light coloration.
To the main point: The only feature that's unusual to my eye in the top two pics is the number and definition (=contrast) of the lighter and darker stripes. In other words, I fail to see something unusual about the colors in the two top pics. Perhaps the photos do not convey them right? ... and the photos are a bit dim/grainy too.
Anyhow, if you can elaborate on your hunch / knowledge and describe exactly what correlation you found out, that'd be appreciated by many, I am sure.
ATM, all I understood is that you say: if the light stripes are notably lighter than usual (on the grayscale I assume, not more yellowish or more orangish or anything like that), it is going to grow into a flash zebra jur.
and also coz I really missed my old flame 
