I've had two more examples shown to me via Instagram... so with your MoC Chris, that's already up to four examples
I'm actually starting to think it may not be degradation, but possibly just a light or miscoloured batch of plastic as so far they are all the same COO and all the same tone.
Something like the Hoth Trooper or green limbs Chewie all seem (from what I've seen) to be various colours (within a tolerance) and in some cases can be seen at differing points of degradation too... these all seem too consistent.
Certainly don't think it makes it more valuable (though of course someone will be thinking Geishia or Ghost Face variant £££
), certainly makes it interesting though.
Instagram has also thrown out a yellow cuffed WBBG... that really does look a case of paint colour degradation though as it appears to have a redder tinge at the edges - always learning and seeing new things no matter how long you've been collecting