I personally never want to see a BGS 9.5 with any subs below a 9. If its even possible. Having any sub less than "mint" in my opinion throws the cards right off the Gem Mint grade.
I wish BGS would go to a full point system as the subs have made everything inbetween so subjective. The difference between a sub 9 vs 9.5 or 9.5 vs a 10 are basically the same as good day or bad day.