Investigators, not prosecutors. Investigation aspect of the cases is the key to criminal cases, takes massive time and energy.
https://www.breitbart.com/big-government/2018/03/31/turley-sessions-using-utah-federal-prosecutor-much-better-trump-2nd-special-counsel/
Turley said President Trump should be very happy that Sessions chose this route of appointing Huber, who has the power to seek indictments and prosecute cases, and teamed him up with Horowitz, who has 470 investigators at his disposal, if the president wants to see swift and decisive action.