The centre back who steps out is the most underpriced player in the market

Defending the channel in front of the back line requires a specific temperament, and recruitment departments still pay mostly for height.

A midfielder receives half turned in the channel between your centre back and full back. Everything that happens next is decided by one man in the next half second, and it is not the midfielder.

If the centre back steps, arrives on the front foot and makes contact as the ball does, the attack is over before it started and the crowd barely notices. If he holds his position, the receiver turns, the back line drops five yards, and now your defenders are retreating towards their own goal with a runner going beyond them. Same pass, same players, two completely different matches, and the deciding factor is a temperament rather than a skill.

I say temperament because the physical requirement is not extreme. You need to read the pass a beat early, cover ten metres, and be comfortable being wrong in public. The last one is the filter. A centre back who steps and misses is exposed on camera, alone, with his defensive partner gesturing at him, and the highlight lives forever. A centre back who never steps concedes exactly the same goals in a way that looks collective and unlucky.

Recruitment reflects that. Aerial win percentage, clearances, blocks, duel numbers, height. All of these are countable and all of them describe a defender who does his work inside the box. The player who prevents the entry pass from becoming anything at all has a statistical profile that looks quiet, because his best games contain almost no defensive actions in his own third.

There is a real argument against him and it is about partners. A stepping defender is only viable if the rest of the line covers behind him instantly and the holding midfielder drops into his slot without being asked. Get that wrong and the aggression that saved you thirty times a season hands over two goals in a week, which is how these players get labelled rash and drop a division.

That is exactly why they are cheap. The behaviour is high variance, the failures are photogenic, and the successes are invisible.

If I were buying defenders on a modest budget, I would ignore the aerial charts entirely and watch fifty clips of players defending forwards. Then I would pay for the one whose mistakes made me wince.