CGC has a pristine 10 and perfect 10, Pristine being one of the grades is a 9.5 and perfect being all around 10. The problem is if you didn't pay for subs previously, the highest you can get is a Pristine 10, so even if it was a perfect 10 you could only get a pristine 10.
What I am figuring out is that you have to "Grade" the card again to find out of its a perfect 10 or pristine 10, but you might as well pay the $10 to get the sub grades along with the grading tier. I was hoping there was an option to just submit as reholder to get the subs but unfortunately it seems like that is not that case.