This may be true but you simply can't make the mistake Walker made. We may get caught out playing aggressively but that's just a player not knowing what's going on around him. I don't think that's due to the system. They could've been on the offensive if he had simply retained possession of the ball. It's inexplicable. And he fell asleep on the Burnley equalizer too. I'm starting to have questions about him.
I see your point he has always had that aspect in his game for spur's and England but I guess Pep measures it against what he brings to the team.