A: Since this one’s a little out of my league, here’s the answer from Leaf Cigar Bar COO and Certified Master Tobacconist, Jeff Brown:
It is possible that the wrapper was light in an element (potassium/nitrogen/iron) and therefore it burned darker. Keep in mind that a normal plant will usually yield a few wrappers. It may have been a plant on the outskirts of the field that looked like the rest, yet did not get all the nutrients that the other plants received. During the sorting and fermentation process, you can’t tell 1) where the plant came from, and 2) what nutrients in it may be lacking. I would bet there are a few more like it somewhere in the world as wrappers tend to come in pairs from the plant. – J.B.