Mueller's hat just went from gray to black.
BIG.
That 470 might have nothing to do with Mueller.
Agreed, not difficult. If Mueller was now wearing a white hat, this little interview would have taken a different tack, and Mueller's answers would have been much different. He just handed Barr the reasons why he could go ahead and shut down the investigation.
Then again, maybe that was the plan all along. I need to ponder this a tad.
Since you pointed at me, I have to confess I'm not so sure any more. I can think of circumstances under which Mueller would give those answers as either a black hat or a gray hat. We don't have the full conversation, nor do we know the circumstances under which it took place. It looks like Barr is in a position to wind down the investigation, however, if he is so disposed.