My problem with him, is that he is nothing special to warrant so much playing time. Yeh he is not bad, but he is so average. Excels at nothing. Is like a passenger.
We went from having 3 wc dudes (4 if you include preinjury cheesio), whose each had seomthing really good to offer.
Pogba has physical presence and was good with the ball at his feet, doing some nice things with his talent.
Pirlo, everyone knew what he did.
Vidal, added physical presence like no other
Marchisio had a great balance of everything.
The 4 of them never shied away from their duties on midfield and were talented in their respective duties.
Khedira, on the other hand, is very average at everything. He doesnt defend properly, doesnt run his lungs out like less talented players like padoin and sturaro, he doesnt offer anything extraordinary in attack.
The worst of him is that he loves to evade responsability by passing backwards and running into space to wait for something to happen.
Yeah, he does some nice runs sometimes... but we dont need him to do that. We have other offensive players for it. He should support those offensive players by keeping the midfield tight. But he doesnt.
Thats why pjanic looks much better with matuidi, who is not a wolrld beater but he offers tackles and physical presence.
I dont know how to defend his starting place in a midfield 2. And even when he can be better in a midfield 3... you coud very well improve that midfield by including someone like marchisio for example... who doesnt shy away from possesion, and has some tackling and great passing.
Yeh, we can say that this is what we have and we have to use him... but thats not an excuse to just keep dependiing on him. This excuse could be accepted in his first season here, but this is his 3rd and allegri still depends on him.
We can continue using him. But as long as he is an undisputed starter for us, there will always be a margin to improve