Good post. This is pretty much my take on things as well.
One of Mueller's former associates, who is now a tv pundit, seems to think Mueller is pursuing three lanes of inquiry - Conspiracy (aka Collusion), Obstruction of Justice, and Financial Crimes. The unfortunate part of all of this is that Trump isn't behaving like an innocent person by trying to constantly undermine the credibility of the FBI and Mueller himself; and by having his lackeys like Hannity and Devin Nunes constantly cooking up nonsense in order to try to undermine the FBI's credibility.
Ultimately, innocent people are fully cooperative because they know they did nothing wrong and are confident that they will be cleared. Trump is basically doing the opposite.