This has long been a point of debate here mate, and will continue to be until the cows come home from wherever they went in the first place!
My take on it is that his agent was a malevolent force in the 'go-to-Chelski' debacle, and that this summer, a deal had ben struck with Madrid before they suddenly backed off from the asking price and tried to (errr) 'do a Levy' and get him cheap cheap knowing they'd got ride of the competition for his signature. they'd softened the player/agent up! And I think, once again, the idiot was poorly advised that if he didn't go on the US tour, the move would go through quicker. Foolish I agree. Hence his quick apology when it became public and no-complaints when told to train away from the first-team until he left.
Interesting thing is that he could end up being another case of 'be careful what you wish for' as Madrid seemingly have him as an expensive acoutrement and not a player who bears much importance to them. Ironically, he could well end up being a part of a 'system' already in place. Would've been the same thing I see AVB developing for us, except here, the truth is he'd have ben a regular part of that system, whereas at Madrid he will firmly only be a squaddie...