We had plenty of men behind the ball for all of those goals. As for leaving no space behind to run into, that would mean we abandon our pressing game pretty much and pile defenders into the box and it becomes defence vs attack... Do you really see that working with that defence today? Did you miss Maddison's goal?
We had abandoned our pressing game anyway, as far as I could tell. Zero pressure on the ball was a bigger problem than our defensive line in the first place