If I remember correctly there was some time between the leak and the formalization for Weis or Kelly or both and an intensive background vetting process was the explanation

we see that delay with assistants all the time already. I don't know why there would need to be some notable additional period of vetting.

when he was hired as DC?

Maybe the same one applies to HC as well. maybe they’re haggling over contract detailsz maybe its a pr strategy

Potential for an assistant to be promoted to the top. If would look far worse if he had been an assistant and during a HC background check it came time light that (insert whatever). We would be a laughing stock for hiring him previously.

It certainly shouldn't wait until after the committee convenes. I think they typically watch games "together" on Saturday and start placing teams in real-time before the reveal Sunday at noon.

It's imperative that he holds the title of head football coach on Saturday morning at the latest.