Guys, really, Simmons in the Starting lineup. So who is going to handle the ball. Simmons is not James Harden. Parker has played very well defensively of late.
The offensive efficiency would drop much more than the defensive efficiency gained from subbing Simmons for Parker. If you going to take Parker out, you are going to having replace Green with Manu as well because of this very reason. Simmons can create but can he RUN AN OFFENSE, absolutely not at this point. He has quite a ways to go before he can do that. And Quite honestly I don't think he ever will be a guy that can consistently do so. That is why he pairs so well with KA who can run the offense.