Poch's system relies on pacey fullbacks who stretch the defense and can create space for the AM's to work inside. Chadli comes in from the left, and Lamela from the right. We have that with Rose at left back. At RB, we should have that in Walker, but he never really tried to get the ball in the box when he got into the wide area(and neither did Townsend from RW). Now that Walker is hurt, we have Dier at RB who is slow, so he rarely gets behind the back 4 and is unable to create space for Lamela to work. We should be playing Yedlin at RB right now, as he has a good cross on him to go along with his pace. That should open up space for Lamela to operate.The fact is we are a one paced team. Its very easy to defend against if everything's in front of you. for us to get in behind teams now it generally either has to be rank bad defending or a perfectly timed run and pass from deep. You need to offer that threat in behind imo. I'd bet if you asked any defender at any level from any era what is the hardest thing to defend against I would guess pace would be the one thing they would say. you obviously need ability and composure as well so I'm not sure why people keep on bringing up Townsend saying, see pace doesn't matter. Not only that, I actually only think Townsends pace(which I don't think is that great) is with the ball over long distances. I don't think he has that burst over five-ten yards with or without the ball. I don't believe you need pace to be a good player but you do need pace as an ingredient In a team, definitely.