They were the best team in the regular season, and the champion has not yet been crowned, so at this point, the reigning number one seed can be as cocky as they please. I honestly don't see the "cockiness", though. I really don't. Joe Johnson's next media quote will be his first, and Marion seems to have a chip on his shoulder, and he should, considering he's the most underrated player in the league. Amare is the only one that has anything approaching cockiness, but it's not brazen Barkleyistic arrogance, it's just a world of confidence in his abilities. Considering his play and his team's record, he's probably entitled.
As for the Spurs destroying the winner of this series... we'll see. I think both Dallas and Phoenix have what it takes to beat San Antone.