Yeah, I think that team could eventually win a championship, but only if they committed to a team game. Not only are the guys listed uber-athletes, but most of them are good-to-excellent defensive players.
The problem, of course, would be chemistry. Thomas, Smith, and Robinson, at a minimum, are all head cases.
(Also, not that it matters, but I don't think Gerald is one of the top 12, or probably even top 50, athletic players in the NBA. He's a great leaper, but that doesn't make for a great athlete. There are few guys I remember who are less fluid and graceful on the court. Gerald plays stiff, unlike any of the other guys on your team.)