He may have proof of a relationship. That’s different from “everybody knows”.
Exactly.
Just as the prosecution of the Senate Select Committee on Intelligence staffer with his "boom-boom for a scoop" reporter Ali is revealing, leaks and the relationships between sources and news organizations can be varied and complicated. He had other reporters he was scooping without personal relationships.
Some of these relationships are complex and some illegal. The Congressional investigations led to McCabe's firing and who knows how many other resignations along the way. If Nunes can show an illegal transfer of information between Comey and this blog owner, that is aother good thing.
The speed and abilities of Congressional hearings will never satisfy the "get a rope and hang 'em" crowd, but you have to do things within the law or you are no better than the law breakers who we despise.