But let's take a step back, the entire Russia bullshit was started on the Steele Dossier which essentially was Russian disinformation that had no basis of being true. But apparently, that's all it takes to get a FISA warrant sign off at the Obama DoJ.
That IG report determined that the investigation was not 'started on the Steele Dossier'. It was Papadapolous bragging to an Australian intelligence agent that the Trump campaign knew that Russia had dirt on Clinton and would be using it. When they became aware of the Steele dossier, the investigation was already under way.
Also, Carter Page was already under FBI investigation (like Paul Manafort) before the Trump campaign even existed.
We knew of Russian interference since 2016. It did not take a special prosecutor to uncover it.
Mueller uncovered exactly who did it and how - from the fake identities used to buy servers to the bitcoin transactions used to pay for them to the relationship between wikileaks and Russia. The details Mueller was able to figure out are impressive, all while being obstructed at every turn by the
President of the United States. And that's only based on what's public.