While the US did get killed in that presidents cup, I find it hard to say that Tiger was the leader of the team. Not only was Nicklaus the captain (who has gone on to win many others... showing that odd things do happen, such as the US winning without Tiger), but the team consisted of Calc, Couples, O'Meara (fresh of TWO major victories), Love III, Duval (had 8 wins over the past two years), Furyk, and Mickelson (who was still considered a great young player). While everyone knew that Tiger was talented, he wasn't considered greater than all these guys at that time. I think Duval was even ranked higher than him that year. Tiger by no means was Tiger a leader on that team.
Robert