Any reason why NBC would need another person? Isn’t it possible to have too many people yakking about what’s happening (or happened) on the field? Hey, Vince Scully was always the only voice needed for the Dodger games. He did a great job. Maybe it’s different in football?
You need the play by play guy then a color man. A good mix is a defensive guy and an offensive guy to balance one another as color commentators and give some insights on plays.
Journalists don’t belong in the booth.