Jasper Juinen/Getty Images
Much like the 3-5-2, the dawn of the 4-3-3 is borne out of the rise in agile, mobile and versatile footballers.
At a top tier level, you won't find players with specific sets of skills, but rounded sets transferable to several positions.
Arrigo Sacchi once spoke of the need or desire to rid the game of specialists. By that, he meant to do away with the "Claude Makelele role" and instead use a player who can pass, tackle, shoot and head it.
The 4-3-3 is a major step toward that, as each player is involved in multiple phases of play. The full-backs and midfielders, in particular, need to be physically superior, multi-talented and possess the desire to win.
It's a hard system to play if you're not cut out for it, so someone like Etienne Capoue, who focuses on tackling only, would suffer.
Joao Moutinho, however, who is full of energy, quick on the turn and comfortable on the ball fits perfectly.