Zonal marking takes the blame because the camera makes it look guilty

When a corner goes in against a zonal set-up, the replay shows nobody standing next to the scorer, and everyone stops thinking there.

Concede from a corner while marking man to man and the analysis is about one player. He lost his runner, he switched off, he got blocked. Concede the identical goal from a zone and the analysis is about the system, because the freeze frame shows a header being met by a man with two yards of air around him and no defender in the picture. Looks damning. Usually it is not.

A zone is not marking space. It is marking the ball's flight path. You put your best headers of a ball on the six-yard line where the vast majority of corners actually land, and you attack the delivery rather than a person. The whole point is that you do not care who is arriving, because you are in the way of the ball before the arriving happens. When it works, and it works most of the time, nothing is memorable. The ball gets cleared to the edge, the commentator says nothing, and the sequence never appears in a highlights package.

When it fails it fails visibly. Someone attacks from deep, arrives on the run into a seam between two zones, and gets a free header. That seam is real and it is the genuine weakness. But the fix is not abandoning the scheme. It is the two or three man-oriented players that every decent zonal side actually uses, whose job is to run with the specific threats while the zone holds the flight path. Almost nobody plays pure zonal. Almost every criticism of zonal marking assumes they do.

There is a scoring problem in how we judge this too. Nobody counts the corner that got headed out at the near post by a defender standing exactly where he was told to stand. There is no stat for it, no clip, no credit. So the ledger only ever records the failures, and a system that concedes fewer but louder goals looks worse than one that concedes more but quieter ones.

My honest position is that the argument has gone tribal in a way the evidence does not support. Set-piece defending is a profile question first. If you have four players who genuinely win aerial duels, most schemes work. If you do not, no scheme saves you, and switching to man marking just means the goal comes with a name attached instead of a diagram. Which is more satisfying for the phone-in and no use whatsoever to the manager.