FTP flashpoint and ops participation are heavily restricted (3 a week i think?) and if they're doing ops already they must be former subbers, who will be slightly more savvy and better geared. Besides, lack of sub is not related to ability in the slightest. This FTP lark leaves a lot to be desired, but let's not pretend there's a problem where there isn't one.
Well, at 3 chances per week, it does mean they are less able because they haven't practiced as much.