Its not the same game any more.
Innovation arises from changes in rules, talent availability, and other trends. Changes in the NBA rules in the last decade have changed the way the game is played inside. Players can no longer be manhandled on the perimeter which means that size and strength (while still an advantage) is not nearly the advantage it used to be. I really believe that if KJ had played under the present rules, he would have been one of the best ever. Allan Iverson's career would have lasted longer as well. That little guy took a beating that he would not have to endure today.
It is not just the Suns that are going with smaller lineups and stretch 4's. It is happening all over the league. Miami was in the finals without a real center at all. Roy Hibbert, who would have been dominant 15 years ago, was rendered irrelevant by simple strategies using the new rules for an advantage. In fact, the beginning of the end for Indiana was when the Suns, twice in a week in the middle of the season, spanked them with Frye playing outside and rendering Hibbert basically useless.
Its a new game. It demands new strategies and a different kinds of players.