But if then you have the opposite fullback pushed over, then you have a gap between the fullback and centre half for a midfielder or attacker to make a run through. You can’t do both. so it’s the lesser of 2 and that’s forcing them out wide not through the middle.
it’s either fullback or wingers job to limit deep diagonal option. If we cover that well, we will restrict spurs to sideway passing because there isn’t much option except deep diagonal balls.