Robben was injured quite a lot, he also had a parrot on his shoulder in his father 24/7, it made sense to sell him and as we have proved before we will not stand in the way of unhappy players if it meets the financial needs of the club and the player is surplus to requirements. Mata didn't suite what Jose wanted, we sold him, now whilst people argued back and forth who was right and wrong in the build up to the sale, who is looking fruitful now? I know, but it's up to you to make your own assumptions on it.