I see almost all of Self's comments about players as having a manipulative component to them as Coach Speak often does. Saying Mitch was the best player today gives Mitch a boost and digs the rest of the team so win win. TBH he was pretty effective and for once he appeared not to be running about dazed and confused. Yes the opposition was not top of the line but he has looked scattered against worse teams this season.
I like Mitch a lot, if he wasn't stuck in the 2nd big role, at least for now, I believe he would do a pretty fair job as 3rd big and as 4th big he would be just fine. He is being forced to grow into a position he wasn't chosen for and probably even he didn't expect this soon. Mitch needed a quality performance to help settle him into his current role. It won't make him anymore capable but I'm hoping it lets him settle down and use the capability he has consistently. Don't get me wrong, not advocating more minutes for him 10 plus or minus 5 is what he should be getting at this point and I hope that is what is needed from him in the near future.
Also, note the free throw percentage improvement? If he continues to settle down he might get some end game minutes just for that alone ;)