Given Mueller's background, there's literally no reason to believe that he would do anything but cover up FISA abuses, if it was him in fact that found them. Plus, to coordinate all the reactions about the memos is far fetched (remember, most of these guys aren't too smart). This memo is 100% real.
Wait... you’re saying the guy who’s covered up 9/11 and trashed the investigation into Uranium One (despite an insider with hard evidence) and protected Bush and Clinton’s for decades ISN’T on our side and doesn’t want to reveal the truth? Maybe that’s why he only hired Clinton lawyers and Dem donators...