If Comey is now a central figure in leaking information to the press, I would think Mueller would need to recuse himself or resign as special counsel due to his prior relationship with Comey.
That will be the next shoe to drop.
Mueller is a D.C. insider which means he is most likely a scumbag with zero honor or integrity. I suspect he will hang on until he is fired and dragged out of his office, kicking and screaming.