He never was the silent type, if I remember correctly (very positive about this). But we are talking about now, if he came do you think he would be quiet on the bench? No way, not after all the bitching about Juventus he said this year. Frankly if you don't see this, you're clueless.
He was on the bench in the majority of two years making little fuss, except when he got fed up in latter part of last season. Prior to that, it was a comment here or there about wanting more playing time, hardly bitching. But somehow his latter frustration has been painted as him publically bitching all the time for 2 years, bit silly.
And regarding NOW, which player, wants to be on the bench, nonstop, even if you you play well enough in games, but then go back to the bench for months straight (was periods where he didnt play single minute 1-1.5 months). Ofcourse one would get fed up, after 2 seasons, and find playing time elsewhere, self-explanatory.
And what do you qualify as bitching? That he thinks he saw too little playing time? True, that the club didnt want him? True, its weird to be antagonistic about him for little reason. Its just common sense. Player doesnt get a chance, goes elsewhere to get it. And he is not eager to come back to those who dont want him, especially as he gets regular playing time elsewhere, and does it well enough to be in NT. How is wanting that a primadonna?