Shaka,
it was posted here by IMGGorBUST, BennyJ and maybe by others, that there is certain sequence of steps during the review process. According to their greatly appreciated DD supported by verifiable links, the decision between 510k and PMA is made much earlier in the process, we are way past that point. Since I don't have the patience and experience to do my own in depth DD, I will gladly use their findings verifiable by attached links, over somebody's hunch.