Sessions recused himself. It was likely to be a sticky mess to get him un-recused. Resignations and removals put Whitaker in place to take over as head of DOJ.
Legal minds say the special counsel report now goes to Whitaker, who can accept it, not release it, and not act on it. What purpose do the POTUS tweets serve now that RR is out of the loop? Is it pressure to get Mueller to finish up sooner rather than later? Or, is it a misdirection to focus the opposition's attention on Mueller while other parts of the plan are put in motion?