I think this is relevant:
Gold Medal Superstar Theory
I'm not completely sold on it, but it does bring up a good point. The only team I can think of in the last 50 years of the league that has won a title without at least a bronze medal or silver medal superstar is the '04 Pistons. They're the exception rather than the rule.
I do actually believe that the PG being the best player on a team hurts the team, however. Look at Chicago in the playoffs last year, for example. The Heat shut him down and nobody else was able to pick up the slack. If you look at championship teams where the PG was the possibly the best player on the team... you have the 80s Lakers & the 80s Pistons, and that's it. Magic had Kareem, another gold medal superstar, and Worthy (a silver or bronze, if I recall) on the squad, too - both of whom could generate their own offense. The Pistons had many guys on their squad who could generate their own offense (Dumars, Microwave, Aguire, etc).
Does that mean anything in particular? No. The two aren't mutually exclusive; a team with their best player as PG
can win it all. I do find it odd, however. Of course, Rondo isn't going to be the best player on any team (unless the team is trash), so that's not really an issue there.