Silva is a ball player - he is not ideal for that role. He is best with the ball - not without. Müller's role - particulary in matches like the one you named - is to move around the defenders and create the space - and be there in special moments. Silva is wasted in that role. Has somebody of you seen the match from Germany against Norway this Sunday? Germany played with Götze on the 9 - he was wasted there (seems to be off form, too) but with him occupying the defenders it gave the other three offensives chances. The reason why Löw does not like playing Müller on the 9 is that he is best when he is played behind a striker (even a makeshift one) - and as his actions seem to be atleast always the winning guarantee whenever the competition is not called EUROs he is right with it. It paid out Sunday, too - Müller had 2 goals and an assist in the 3:0.
Why I tell you that - Silva is in a great form. He is best behind an attacker. He should not be
wasted elsewhere.