Huber is not conducting investigations directly. His limited role is to “make recommendations”:
...“These senior prosecutors will report directly to the Attorney General and the Deputy Attorney General [Rod Rosenstein], as appropriate, and will make recommendations as to whether any matters not currently under investigation should be opened, whether any matters currently under investigation require further resources, or whether any matters merit the appointment of a Special Counsel.”
Sessions revealed Thursday in the letter to top Republican lawmakers in both chambers of Congress that Huber was the senior federal prosecutor leading that effort...
Yup.
The way I read it, Huber, in concert with Horowitz is indeed conducting an investigation with instructions to recommend to the AG and or DAG for prosecution or appointment of a second SC.