Even though the dossier was paid for by members of the DNC and created by Fusion GPS to discredit Trump.
I'm no fan of Trump.
Are you speaking of the "guilty plea" of Flynn? Where he was told by a senior member of the incoming president's team to coordinate sanction relief with Russia? Something that is not illegal, and which the journalist, Brian Ross, was suspended for his lazy "journalism". Flynn only plead guilty for lying to the FBI. That's all.
Which other evidence of the collusion do you find compelling? The DNC "hack" has been debunked technically by William Binney and other members of the founding NSA community, confirming that it was a LEAK.
Mueller is seen has some non-bias actor in this whole thing. If you ignore his entire past.