Lebron and Dwight both re-signeded with their teams initially aswell (much like Durant they were restricted free agents).
Their secondary and tertiary peices were guys like Antwan Jamison, Mo Williams, Rashard Lewis, Hedo Turkoglu, Larry Hughes, end of their career Gilbert Arenas, Vince Carter and Shaq.
Do any of these guys sound like OKC or Spurs guys?
This isn't intended to discredit Duncan or Durant. I agree they are very level headed and rather humble guys. But Lebron and Howard only got their reps AFTER they left their teams, who were doing a rather poor job building around them. Throwing money at inefficient players who had a name.
OKC and SA kept snagging up efficient well rounded players when no one else was looking.