Yet it is still worth recalling the words of Pep Guardiola shortly before he stood down as Barcelona manager in 2012. "Alexis Sanchez has stolen my heart," said Guardiola. "He is very young, but he came forward and sacrificed himself a lot. He is very humble. I think the club has made a special signing."
Speak to anyone at Arsenal, and it is quickly obvious that researching Sanchez's personality was as fundamental to the scouting process as his footballing qualities. And to understand Sanchez, to appreciate the mentality that is so admired by both Guardiola and Wenger, you must also know about a small coastal town called Tocopilla.
There are less than 25,000 inhabitants in Tocopilla but, beyond being the birthplace of Sanchez, it has attracted global attention for also being the town in Chile that was most devastated in 2007 by an earthquake that reached 7.7 on the Richter Scale. It displaced 15,000 people and destroyed 30 per cent of all structures.
Sanchez enlisted the help of Messi and other Barcelona stars to raise awareness and funds. He also returns each Christmas to ride through the streets of Tocopilla alongside the mayor in an open top float to disperse presents to local children. "Here in Tocopilla, those who saw him realised he was one of a kind," says Juan Segovia, his teacher and first coach. "All clubs have wanted him. He played with adults and was not afraid. And you could tell, he had it in his head that he wanted to become a professional footballer."
Sanchez is hungry and ambitious and built like a middleweight boxer. He's also just as deadly.