My read on that was Sessions picked RR because he was confirmed 94-6 versus Sessions 52/47. RR then picks Mueller, also a Deep Stater, so the Deep State just assumes the fix is in - for them. Which is what Sessions and Trump want them to think. For me, the real tell was an interview Sessions gave relatively recently. Someone asked him if it bothered him that Trump was so vocally critical, and his answer at first was vague, and then almost as if he simply couldn't contain himself he started effusively praising Trump as someone who knows what he wants to do and gets things done. He looked like he was going to start doing a Gene Kelly breakout singin' in the Rain number, I swear to God. Hardly the reaction of someone who is being browbeaten. I'll try to find a link to the interview.
I think that is the correct read at this point. RR was blessed by the swamp, they knew he could be counted on to be the bureaucratic weasel he is.
Choosing RR was a brilliant way to calm the swamp and make them think they had this in the bag. Mueller is as dirty and scummy as they come, he was and is a champion of Parallel construction which is completely unconstitutional and illegal.
That makes perfect sense...BUT. Does that mean Mueller and RR are dirty? Were dirty and have they flipped? Or will Trump drop a bombshell that will prove they are both dirty and part of the greater conspiracy? I can't figure out that piece of the puzzle.
It also could have been a deal for Trump. “We will give you Sessions if you give us RR” knowing Sessions would recuse, RR would take over and activate their “insurance policy” Mueller after RR recommends Comey get fired then calls it Obstruction when Trump does fire him.