In regards to Gaston, I think Cerb did that one. I know I researched Gaston too and I read in a paper from Notre Dame that said he recieved a full ride.
I think it was partially due to grades and partially for his ability. They say he's a heck of a catcher though. Not sure why no one heard about him, it could of been because he wasn't signable.
To answer you first question I have no idea. In all honesty this is only the second draft I've ever really paid attention to, this one way more so then last years.
I knew a few things about other picks, but nothing like I do now.