After watching the uber long Mou interview. I finally understand why he does not prefer Mata. He wants the team to be proactive, not reactive. He wants his front players to press down the opposition when they get the ball. He want tireless runners in the attacking quartet. That's why he chose Oscar over Mata. Simply because Oscar closes down on the opposition a lot when they have the ball.

In a way, Mou is trying to help Mata. Watching this it's clear Chelsea want to implement a pressing style similar to that used by Barca/Spain. If Mata can improve his game and include pressing the opposition when they have the ball in his game, I'm sure Mata can be in the Spain starting line up.

Mou wants Mata and Oscar to play together. But Mata's playing style for now, still does not suit Mou's philosophy. He wants the attacking quartet to trap the opponent when they get the ball. So if Mata improves on that, I'm sure we will see the return of MaZaCar combo.