Pass blocking was pointed out as one of Walker's weaknesses in the draft write-ups. Potential of course that he could be coached up to do it, but he's not coming in with that skill set already mastered.
Well, totally disagree with your football comments, but I can respect how you personally feel about military titles being used on a message board, as it definitely is your right to express your opinion (that's what message boards are for, right?).
He's got a really decent 10 yard split (1.67 seconds), so maybe they see something there to work with. Think NFL Network said the top pash rushers in the league are around a 1.63 or better on their 10 yard split times.