All that "evidence" has already been shown.  It is enough to justify further investigation into the question of whether an American Citizen attempted to improperly or for improper purposes interfere or obstruct ongoing Federal investigation or proceedings.   If there is a possiblity of obstruction of justice, it makes sense for the Federal Government to investigate it.   Reports are that further investigation is being done into possible information or knowledge that can be obtained from others, for instance who may have witnessed or been on the receiving end of corroborating or exonerating evidence.   Could a grand jury indict an American Citizen for obstruction of justice based only on the evidence known?  Maybe.  That, at the very least, justifies further investigation so that a complete picture can be had.  To say otherwise argues and advocates for allowing cover up, or giving someone a "pass".