[mrexroad]

He did answer what you asked, but I think you may be losing sight of the forest for the trees here. Maybe re-phrasing will help?

[Dylan16807]

They explained how something could cause uneven spots and low average, as far as I can tell. Because those spots leak so much.

But I want to know if there is a way uneven spots could cause a problem without some effect tanking the average. What do uneven spots themselves do?