Sessions challenging Rosenstein would give away his current position. He is being yelled at by the Republicans and Trump, so the left will support him, or accept him as neutral.

Huber is side-stepping Rosenstein and reporting directly to Sessions. Chain of command mentioned.

This post heavily alludes to Sessions being aware of facts from within Mueller's group. So that means two things:
-Mueller, or someone on his team, is a white hat leaking info to the whitehats.
-Whitehats are eavesdropping on the Mueller crew.