"There will be a few stars who clearly should make the team, and many players who clearly shouldn't. The only place your judgement makes a difference is in the borderline cases."

Jason13 is saying that there are plenty of cases where the "stars" often appear mediocre until they hit stardom, at which point it's too late to bid for their talent. It certainly makes a difference whether your team includes the stars or not, and since they often won't be obvious at the initial selection...