Privately informing Jimmy of the position isn't the final decision; of course, we must wait for the official job transfer notice, which means Jimmy and Ruiz haven't discussed much and continue slacking off at work as usual.
Department leadership changes have never been simple. David has been in charge of the Anti-Gang Unit for two or three years, and to suddenly be transferred out is quite unexpected. To ensure a smooth transition for the Anti-Gang Unit without causing any disturbance, David needs some time to arrange for his trusted aides and his future plans, as well as other possibly affected areas. In short, it's not as simple as parachuting a leader into a company, especially since David hasn't made any mistakes or had any accidents, and Dave and the others aren't about to just let go of a Supervisory Special Agent-level person.
