There is some evidence that Ben Wallace was playing at a superstar level that year for the Pistons, and it wasn't recognized at the time because of how hard it is to measure defense.
The Pistons proved that having 5 all-NBA caliber starters can win a championship. That's not surprising. If anything it proves that the idea that you don't need a superstar player to win a ring is a fallacy.
so what's easier? getting a couple superstars? or getting 5 all-NBA caliber starters?
i'd say the 2nd option but I still believe a team with a couple superstars will win more than them.
That's hard to say -- we've all spent a really long time trying to figure out what makes a superstar a superstar rather than a "very good player", and I still don't think there's an acceptable dividing definition out there. Also hard because you can't play the way the Pistons did anymore: the league changed the rules to make the games more watchable.
Worth noting though, that the Pistons traded for / signed in free agency the key contributors to their championship team. Also, they had Larry Brown at the reigns, one of the best coaches of the era/all time.