Imagine you had someone reporting to you that was leaving his position on a certain date for any reason. Would you allow that person to make large finical decisions? That employee, regardless of what position he may hold, is no longer invested in the same way.
If you want to say that argument isn't valid, you have to also consider that Hart's vision and policies may not line up with the next ADs. You don't want him handing out a two year deal to a high profile assistant if the new AD is planning on dumping Butch after 2017 because he doesn't think Butch can meet the new AD's expectations.
Furthermore, if I'm a coach, I want to know who the AD is going to be. As an employee, I want strong leadership, or at least compatible leadership, above my immediate boss.
Hiring an AD in February is dumb if the right candidate is available now. I don't know what Davenport's criteria for right is, but you would think DiPietro would press this.