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.
Sure... but any MLB can make a play if no OL is on him. A MLB (especially in the 3-4) is going to have to deal with OL at times. But Walker often looked like he was watching the ball and then engulfed by a guard and run out of the play. At least here he saw the guy coming and kept himself off the block (by !!! means, to boot). Hope that is a growth point for him.
Ok, I didn't intend to watch a 20 min youtube video, but that was pretty delicious. Skip the commercial for whatever food sponsor he has, but otherwise pretty funny.