I miss nothing. The probe would be carried out by any human being in doj so directed by trump. Trump has plenary authority over doj.
That’s not the way it works. Just as in the military, you don’t bypass the chain of command because without the chain of command, the organization falls apart. You have to fore and replace the persons that are to be bypassed but the Senate controls who can be chosen to replace.
The only thing Trump can do is fire Sessions but that would leave a worse replacement in Rosenstein, and you’d have to fire him too.
Behind Rosenstein, there is no one who has been confirmed.
And McConnell allowed no recess appointments.
So the President has no one to direct except Sessions and Rosenstein, neither of which will investigate.
You are missing the fact that the Senate has to confirm. If there was no confirmation process, then yes, Trump would have a clear road ahead.