I wouldn't put much stock in the MLB top 30 prospects now. I don't think it has been fully re-ranked, other than just bumping up a few guys who are blowing up or changing organizations, since before the season. Moore is not #8, Small certainly is not #11, Mendez is not #13, Valerio is not #16, Perez is not #17, and Garcia is not #20, even without the draft picks slotting in.
Blalock might be close to where he really is, but they're just slotting him into a new organization and not looking at the entire list.