Robert Mueller won't be doing any reassessment. He's not as sharp as he used to be, and is not entirely together.

Source: I was in a meeting with him and his team, where they talked about their investigation. Robert Mueller was answering questions in a strange way (as if half way through he'd forget what the question was), his speech seemed off, etc. His team would jump in to help or cover.

That said, they said multiple times how surprised (blindsided) they were by Barr's "summary" of the report. They spent days and weeks agonizing about every word and their own summaries of the chapters, thinking that everyone woke be reading them. And then Barr made sure nobody did. And yet the team doesn't seem interested in doing much about it. They are enjoying doing roadshows for their law firm, and that's about it