I still think mueller charter is to find and sequester any and all evidence detrimental to WJC, HRC, OBAMA, and any one else they are trying protect. Mueller will ask a friendly judge to seal all evidence as it is necessary for national security. (That is, the evidence he cannot destroy).
I agree that Mueller is focused as instructed, which is narrowly aimed at Trump.
But sequestering and sealing does not work the way you think it does. Neither does immunity.