I watched our D a lot last year trying to figure out why they were so bad. The main thing I noticed from the TV view was we were running "bus stop" where the DE were told not to get up field. Generally, this is used against running QBs so the DEs don't create lanes for the QB to scramble. Now that we seem to have turn our DEs lose, you can see that our lack of pressure last year wasn't due to lack of talent, just awful awful scheme.