The whole investigation was a manipulated mess of malfeasance on the part of everyone on Mueller’s team, including Mueller. He’s just as guilty because he never bothered to find out what was going on right under his nose.
It wasn’t just an investigation. Democrats seized operational control of the “Trump” DOJ due to the recused Sleepy Sessions and corrupt Rosenstein. Rosenstein breezily admitted to the Senate that he rubber stamped whatever Weissmann and his thugs wanted. Apparently, the FBI did too.
If this isn’t an ongoing coup d’état nothing is.
When it came to Rosenstein's scope memos, I stated at the time that the investigators sent him their wish list of things they wanted to pursue, and he just wrote them all into his scope memos. He never questioned any of it, and acquiesced to every request. And Mueller was clueless, not even knowing what his team was up to.