Public relations is part of their business. The fact that both us fans and the press are discussing "why hasn't Kitchens been announced yet" demonstrates that it is a PR issue, and they want the eventual press conference to go as smoothly as possible. That may not seem to be a critical issue, but a professionally run organization is going to want to have everything run as smoothly as possible, whether it is critically important or not. Why do things the wrong-way/half-assed when you can do them right?
Plus...it's simply easier to do it this way. It lets them have one press conference with Kitchens and all three of his new coordinators instead of having one for each. And, they don't have to pull Kitchens out of interviewing/recruiting his staff just to prepare for and attend a press conference.
The written contract itself may not be finalized, but that's only because it is not most urgent need right now. But, you can be sure the essential terms of the contract are done -- Kitchens would not be participating in the interviews of potential coordinators/coaches if they had not already agreed on all the essential terms.
