Between Rosenstein, Comey, Strzock, and Page, it's going to be tougher for Mueller to make a credible argument that the firing of Comey was truly Obstruction of Justice. It is starting to look more and more like the President correctly gauged that there was corruption in DOJ, and that the rot started at the top.
Also, anyone else beleive that Rosenstein was likely one of Woodward's primary sources? Woodward's wild claim about the 25th Amendment would dovetail with the claim that Rosenstein was going to try to organize a 25th Amendment coup against Trump. Obviously, Woodward embellished by claiming that the cabinet actually discussed it as opposed to Rosenstein just trying to put out feelers, but the potential linkage is definitely there.