why is league leader greyed out?

Hey,

I am in season mode and the league leader option on GM is greyed out. Anyone knows why?

When did you start that season?

Either you didn't start the season yet or you're in the offseason,where you'll have a hard time finding league leaders...

or its so early in the season that league leaders cannot be established.

koberulz is most likely correct. The league leaders won't become available in NBA Live 2005's stats menu until every team has played at least one game.