That’s what I was looking for. I’m surprised that a book could still get a 9.6 with any amount of foxing, given its propensity to spread. But at least at one point, that is how cgc apparently looked at it. Maybe the logic was that as long as the book is properly stored, the foxing is unlikely to spread. I don’t know this to be true, and haven’t found reassurance anywhere that the foxing will stop advancing as long as the book is kept in the right environment. I simply speculate this may have been what cgc was thinking
anyway, thank you!