What is the purpose of a Grand Jury?
Does a Grand Jury find "innocent/not guilty?"
Why, if evidence exists, must a Grand Jury proceed with court proceeding (indict?)
Can a Grand Jury find "guilty?"
A Grand Jury can't indict a seated President. Only Congress can issue impeachment.
How did Comey deal with Clinton?
"Here is all the evidence Clinton should be indicted, so we do not recommend indictment."
What if Mueller had done the same? Or could be said to have done the same?