What it demands from a coaching staff
None of this works without the pieces around it. A false nine needs wide players capable of finishing chances on their own, a midfield that can retain possession once it gains the numerical edge, and a squad willing to accept that the man wearing the number nine shirt might spend entire matches never touching the ball inside the penalty box. Clubs that copy the shape without those supporting parts tend to end up with neither a false nine's creative benefits nor a conventional striker's goals.
That is the real lesson of the last two decades, from Hidegkuti's Hungary through Spalletti's Totti to Guardiola's Messi and City sides and on to Arteta's Havertz. The false nine was never a single tactic so much as a recurring answer to the same question: what happens to a defense when the forward refuses to play where a forward is supposed to stand.
