The Pats obviously didn't like any of these mid-late DEs/OLB if Zoltan was above them on their board.
That's not necessarily true. The dropoff in value between Zoltan and the next punter on their board may have been considerable enough to push them to grab the punter they wanted here instead of settling later for someone else especially if there are still a bunch of DE/OLB on the board that they have given similar values on their draft board. I actually think this may be a similar situation as to why they grabbed McCourty in the 1st (a large dropoff in talent once Haden, Jackson, McCourty, Wilson, and Robinson went off the board) and waited to the 2nd to get TE/DE/LB help (where many highly valued players remained at each of those positions).