This entire Stone sentence and the entire discussion here ignores one very basic problem to the whole process.
That is the very beginning of the entire investigation was started under false pretense, and dare I say, ILLEGALLY!
We know now that even the very first FISA warrant that began this whole mess was obtained under false testimony. Now... I was a law school dropout so maybe one of our better lawyers here can add to this or maybe correct me, but from what I remember, any evidence of testimony obtained under illegal circumstances is not admissible in court.
So shouldn't any charges brought about against anyone during an illegal investigation be likewise inadmissible? Stone was only called to testify because of the Mueller investigation right? And now that we know that investigation was totally bogus?