either way I think that the jazz will likely have players as good as Duncan and Leonard are currently. Hayward and Gobert could easily be as good as TD/Leonard were last year.
My definition of a superstar isn't just being an all star - it's being a top 10 player in the NBA - and I wouldn't say Duncan and Leonard are top 10 players. Now, obviously everyone has different interpretations as to what a superstar is but no matter what your definition is...you don't have to have a top 10 player in the NBA to win a championship. I don't believe the spurs had one last year, and I don't think the Pistons had one with their title run. Sure both players had some all star caliber players, but they were a great team because they had A LOT of good players rather than just 1-3 most teams have.