I'm not sure that's the case. I remember reading he said he *liked* how it worked when Villa was played in front of him vs Milan (and one other time earlier vs Sevilla), never that he *preferred*. Why wouldn't coaches have stuck with a strategy that Messi "preferred" and clearly worked better? Also, perhaps it might have had something to do with his fitness and nausea. As the front center man, he was not expected to track back, but playing on the wings, he has to contribute more on ball recovery. He's clearly physically improved this year and contributes more defensively, and that may also have played a part in his move to the right.
EDIT:
This is all I think Messi ever had to say on the subject publically, after the 2nd half vs Sevilla:
"With Villa up front in the second half, Sevilla's centre backs couldn't move forward, which gave me more space."
And you can see everyone (BarcaForum included) agreeing. So the coaches are blind to what was obvious to everyone? Doesn't make sense.
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