Great post and Texans mock Mike. Sounds like you know what you are talking about and hit our needs with those players.
As far as the zone blocking thing, here is a good website to get the general idea if you are interested.
If anybody ever asks you what zone blocking is, the shortest possible answer you can give is that the linemen block zones rather than block defenders
. Digging a little deeper, what this really means is that the linemen are looking for specific areas of the field to block; if a defender happens to be there, they block the defender in such a way as to control the spot. If a defender isn't there, they continue toward that spot, offering double-team assistance only if it's convenient. Once they control a zone, if they're not fully engaged, the linemen can then look to the "second level" for somebody in the defensive backfield to block (on run plays).
Check out this LINK
for more zone blocking information.