He has analysed every victory, every defeat and every player of the Arsene Wenger reign, yet Boro Primorac remains one of the most mysterious characters in the game.
There is no one in football Wenger trusts more, but many Arsenal fans are barely aware of the role he has played in every decision made over the past 20 years.
Primorac is the 62-year-old Gunners first-team coach who people just can not figure out.
I have been speaking to contacts within the game to try to get a better idea why and how he has become such an influential figure in the corridors of power at Emirates Stadium.