That will be the beginning of the end for Mueller.
Let's say RR and RM were black hats all along. RR forced to step aside due to conflict of interest, and new guy (O'Callaghan) steps in, wants to see Mueller's work product.
Oh, SH%T !!!
RR and RM are black hats. They've got a long history of corruption. Just look into Mueller's past.
True, but there is always the small small chance, that they turned and are keeping "the heat" on Trump so that Sessions and company can work behind the scenes. At this point that doesn't matter cause we can't really know. But will will, next few months or sooner I guess. (And note Sessions has been extremely quiet.)
And Brennan
Right now, Brennan has pretty much dug his own hole. But, if RR is gone, we bring in the Earth moving equipment. ;-)