It's Harden's style of play that is the issue. Doc wants him playing within the system as a set up man for a #1 scoring option big man. He doesn't want prime Houston Harden, which he is getting. He wants a less ball dominant, more ball movement, better defending Harden.
Doc wants Garden to be a guy that will go for 20 points and 11-12 assists while playing good defense, not the 28 points, 8 assist ball dominating guy that gives all his energy to the offensive side of the ball.
If Doc has a system in place where everyone else is playing one style, expecting passes on the regular from Harden and Harden is playing outside the system being....well, Hardenesque....that's a major problem.
I'm not going to say it's the reason Philly is 0-2. I think they simply got beat by better overall teams, but if Harden doesn't confirm to what Doc wants, his play will become an issue at some point this year. Let's face it, Harden's style has never been conducive to winning playoff basketball and he generally wears out his welcome with other high level players because Harden's game is all about him. Without a change in Harden's ways, Philly will once again be looking in from the outside once the ECFs and Finals are being played.