Owens Corning duration discoloration warranty claim

Owens Corning Duration, possible shingle defect. In the process of removing 2 shingles for the warranty claim process. I noticed the shingles that are darker actually have a much darker headlap granule. Not sure if it is a single defect or possibly just bad granule drop. Let me know in the comments what your thoughts are. Also if you have had a warranty claim what the outcome was?
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