A word to the wise: you can't, of course, sign seven players in one class. But that doesn't mean that you can't be considered by a player in that class, even after you've signed six.
I just got burned on this. Basically, I left myself open to poaching 'cause the recruit was considering my school AND a school that was full in that class slot - I thought once they filled their six, they'd clear off the considering list and sign for me. Instead, they stayed on the list and the player didn't sign, leaving an opening for a stronger school than mine to come in and take him.