He's been left winger for quite some time now, there's no doubt on that
He's played an AM/SS role for Madrid... Remember him playing striker against us at Mestalla last season!?
He's played on RW for Spain U21
So what people site as an advantage for Silva is actually more true for Mata, he is probably one among rare few who could play all 3 positions in our attack with equal ease(Pedro is one among that group)! To top that he can play the AM as well!! Yeah Pedro did emerge last season but we gotta understand both P! & Mata are of similar mold, only Pedro is a rightie and Mata a leftie! What's wrong with having 2 similar players who are great versatile players and their natural position is actually not same!? Not to mention both are great goal threats!?
And to those people who've been busy saying he's worse than Pedro and Bojan, think again!! Bojan is not a winger so no need to even compare them actually, he's not going to compete with Mata for his place anyway... And Pedro has one good season while Mata's been maintaining his performances for 3 good years now, he's been playing for Spain for more than an year!! How do you keep claiming he's worse than Pedro!?