I'm not sure what you are trying to contend here... The video was Walker seeing an OL coming at him and countering (and knocking him on his butt). My observation was Walker is often oblivious to OL and getting taken out of the play. It has nothing to do how the DLs play. It is about Walker's vision as he makes his way to the ball carrier and countering those that get in his way.
No matter how good your DL is, your MLB will have to counter OL at some point and get off blocks.