The only caveat I can produce for a possibility, regarding Rosenstein, is maybe he was flipped and was then enlisted to initiate a Sting.
This would mean it could have been disinformation to say that “if Mueller is dirty Rosenstein is dirty”. Rosenstein may have simply *stopped* being dirty, taking instead an offer he couldn’t refuse.
Mueller and Rosenstein were at minimum privy to the boldly corrupt Hillary/Obama agenda and activities running through the top tiers of the Justice Department and FBI.
Then comes tricky Sally Yates, under Trump’s fledgling administration. Rosenstein was a pompous moralist through out, an anti-Trumper and in line for AG under certain circumstances, which came about in his appointment as Deputy AG, then AAG. Plausible that he was flipped?
Plausible that Rosenstein made noises and some actions as if he had been flipped, such as earned him the private time with Trump—but until Barr came in and laid down the law (e.g., closing up Mueller’s farce) Rosenstein was pretty clearly still actively working on the DS side, as something of a triple agent, if you will.