Mid-terms. Rosendouche out. Judge appointments. Concurrently continue to build cases.
He will appear when everyone is in the kill zone, and there is no way out. He can't do it now with a divided country and mid-terms undecided.
That is where Sessions is. He and DJT do not work on FR's timeline and its members' need to be entertained. This is serious business what is about to go down, and they have one shot at it.
Hillary is not walking. Bank it.
There's just one problem with this theory: there's plenty of stuff he could be prosecuting that would have zero impact on the recusal/investigation and have minimal impact in disrupting/alerting "the swamp" — as an example, he could direct the DOJ to come down on patent trolls (the companies which acquire patents and then make their money by pushing infringement cases), he could investigate the rampant H1B fraud (especially in the tech sector), he could investigate/prosecute the OPM breach (allegedly from china) from a few years ago [IIRC nobody was held to account], or investigate/prosecute the Wells Fargo institutionalized identity-theft incident [namely how they got out of it by paying such a paltry fine].