Part of the issue with Yaya is he's the absolute opposite of Silva. Silva seems to just love playing football, regardless of the score he wants to recieve the ball and create chances. Conversely Yaya just seems to want to win games for the least possible effort, if we're 3-0 up he just wants the game over and done with. Consequently Yaya doesn't take a major role in demolition jobs and doesn't get the plaudits for them. So automatically he is at somewhat of a disadvantage when it comes to general opinion, and the more we dominate teams the less he's going to do.
But the secondary problem is he just can not work in tight spaces. Largely because he's so fucking huge they are even more tight for him, all he can really do is spread the play wide and take long shots. Dave I think this is your problem with him right?
Then, crucially for me, there's the times we need a goal and there's ample space for him to attack. That's when he comes into his own because he can drive with the ball and his long range accuracy can lead to devastating counter attacks.
Oh and most importantly of all, he has balls. When our other players were spurning chance after chance at Wembley, Yaya won us the game. And I think he feels a sense of responsibility in that respect, his past year has been one of the whole team failing to score when we need to most. Possibly why he takes long shots in the dying moments? A lack of trust.
Anyway to bring it all together, to me he's the most horses for courses player we have. There's simply no point playing him against a side who'll defend backs to the wall [Unless we try him as a ball playing centre back; but that's another debate for another day] because generally he'll run straight into the wall and lose the ball. For me he needs to play in all the big games and away from home, this is where he's at home and his courage and composure come into play. Games like Wigan and Swansea don't come into the equation, anyone could do what he does and just sit and pass.
Edit: I don't even consider him a defensive player, because he isn't. Honestly as a pure defensive mid he's nothing - but he can play that deep lying play maker role well.