I'm ok with both being gone but does the NFL have that authority to tell Ross who he fires?
Ross ceded that authority to Roger Goodell when he asked the NFL to perform the investigation. Depending upon what Goodell tells the investigator to say, Ross will be forced by media pressure to fire whoever Goodell wants gone.
I will repeat myself one more time: the NFL investigation is not and will not be unbiased. The NFL has a vested interested in the outcome of the investigation in that they want to make certain that nothing happens that will adversely affect the profit making ability of the NFL.