Sure, CGC does have it's own rules and there are many results of these rules out there.
My issue with this thread was the notion that the spine ticks must be OK in 9.8 because CGC is applying it's own mysterious grading criteria. This goes against 99.99% of all the comics they graded, the collective expectation of a 9.8 (which certainly does exist), the decades old Overstreet guide that they've aligned with, and common sense for a mint conditon anything. You are correct that I have my own 9.8 definition but it's informed by all of the above.
I accept your right to be an outlier and define a 9.8 however you want. You'll be able to buy many more 9.8s (aka 8.5s) than everyone else!