The full back position is a bit difficult to evaluate statistically. Your attacking output depends entirely on what the coach is asking from you, and your defensive contributions aren’t easily measured the way they are for center backs and holding midfielders.
Joao Moutinho’s numbers don’t immediately stick out. His three assists are very strong for a full back but not jump-off-the-page great like a Michael Murillo. He attempts more crosses in open play than anyone on the team, but he doesn’t scream lethal crosser like a Romain Metanire. It took him a few weeks to break into the lineup, though he immediately cemented his place as soon as he was given an opportunity.