I'm about 95% sure CGC doesn't ignore chipping, I think they just didn't weight on it enough on the AF15 we're talking about. The biggest example of this is the Pacific Coast Amazing Fantasy 15, which without chipping would be 9.x, but with it, CGC gave it a 6.5. Here's another bit of evidence, my FF #4; it's got a chipped tear on the right edge to the right of the Thing's knee where the piece is still intact, as well as a second tinier 1/16" tear to the right of his foot. Without it, that book is a 9.4/9.6, but with it, just an 8.5