Is this right though?
I've seen different versions of the tale. Some people say he agreed to his wages being deferred. Other people say he actually renegotiated his contract so that his wage structure escalates every year, rather than being at the same consistent level over five years.
If he agreed to change the payment schedule of his wages then he's not owed anything, really. Not if he agrees to leave before the contract was due to be completed, which is what we want him to do.
Ultimately, I think (and hope) Barcelona will just make it clear to him that he needs to go. I think he'd be great at Man Utd. However, this whole situation is so messy.