Try increasing your Magnesium intake Mick.
Oh, and on the Mills defense, personally I don't agree with your example and I'll explain why.
The players Patty is asked to guard in the NBA are among the fastest on the planet, explosive and quick.
They also shoot the ball from range, better than almost anyone else on the planet, this is why they are in the NBA of course.
In truth, I think Mills is trying very hard, but I also believe he will get better at defending in isolation, which is what I think you are refering to.
As far as team defense and what he brings to the table for his team, I don't think he is a liability, this is what seems to be the perception and IMHO I don't agree with it...