Lebron teams before vs. Now.

I need to understand from someone who really watches and analyzes basketball: what makes a tram built around 2009-2016 Lebron more locked in and successful vs Lebron led teams of the past 3 years if his numbers are virtually identical?..why can't he be the sole factor anymore?.. And this goes for all the other aging stars..from a decade ago..how are they playing different than their prime, for their teams not to be as successful and efficient as before?...last I checked KD still a top 5 scorer, how is that KD different than the KD that got to the finals in 2012?..is it the rest of the team just not feeling as obligated to be "locked in" around an aging star bc they would rather have their shine?..what intangibles changed between their championship run team dynamics and their struggles the past few years?