The special counsel has Used a standard of proof that's unheard of. He can't be 'conclusively sure' that the president didn't commit obstruction. Well, that means the President has to prove his innocence. That kind of upends 2,000 years of jurisprudence...Sh**'s gonna get real for these fools very, very soon.
...The overarching principle of obstruction law is it's very, very hard to make an obstruction case when there is no proof there's an underlying crime."
Related: The Timeline of Treason.