Does anyone here seriously think that a GK is not dependent on his defence? That could not be further from the truth. A goalkeeper is usually only as good as the defenders ahead of him - a good defence can do wonders to a GK's confidence and performance. Goalkeepers in that way are not that different from strikers like Icardi (who rely on their team to create chances). A GK relies on his defence to hold their positions and defend them well do that he can focus on the gaps. When a GK does not have confidence on his defence, he will make more mistakes. He will do things like coming out more often on corners/crosses even when he is not sure of getting to the ball first - just because he doesn't trust his defence to deal with it. Great goalkeepers may win you a game or two with an average defence, but 8 clean sheets out of 12? You must be smoking something exotic if you think any GK can achieve that without the defenders ahead of him doing their job very well.
It is not a coincidence that Handanovic looked average last season with Juan+Ranocchia in front of him, and now Handanovic is playing like a God. Its because Miranda+Murillo+Medel+Melo are playing very well too (and that we are literally playing with an extra man in the defensive midfield). Handanovic has confidence on which angles the defenders will cover, and which he has to focus on.
I am amazed that some people think GK's are not a part of the defence. These days all 11 players are part of the defence. But the core of any defence is usually the GK and the CBs. Followed by the FBs and DMs. You cannot exclude the GK when you talk about how good or bad a defence is. He is part of the fucking core. Football is a team game after all.
Bandiera is stuck in the corner with his agenda of "Mancini relies on individuals" and everything he says takes him deeper into that realm. I am afraid this time he took a poor example to further that agenda. Inter's defence is working well as a collective effort, despite the odd individual error. Not the other way round. Last season when Medel made a suicidal pass in the wrong end of the pitch, it usually resulted in a goal against us. This season when he does that, the other team has to deal with Miranda/Murillo immediately, and by the time they do that there are 4-5 other Inter players in position. Even if there is an angle to shoot at the goal, Handanovic is covering that well. That is how it works.