There's a presumption that only two people know. Kraft has higher up executives including his son who he consults with on decisions because they will be responsible for the fall out. We also don't know what Bill is willing to accept. He said he would "do whatever is best for the team". To him giving up GM duties might not be what he considers best for the team. We also don't know what extent he would accept that if he was open to it. If Kraft said "we hire a GM, he makes the decisions, you don't get to be in the room or have input, your job is to figure out how to play these guys and nothing else", is thats something Bill can tolerate or does it make him feel like he got demoted to just a grunt worker?