there is a rumor that both Pato and Milan in particular were not happy about playing on an artificial surface. As a matter of fact they pressured Brazil and Pato's agent to pull him. however, they came to an agreement as Pato was already committed.
if you check the games well once Brazil moved to a grass pitch Pato came alive. I have to agree that Jo was a disappointment, he came with a rep but was not at his best.