This is code for "pay for all relief efforts" !
It also says "provide assistance" not take over all command and control !
I used to teach command and control and incident command and the top does "not" direct local forces. During any disaster each area is sectored out and there is one person in charge in each sector not the top or in this case the Feds !
A perfect case of this was on 9/11 when the Gov't had NY, PA and DC as sectors and the Feds provided support to each of them. The civilian world has a chain of command just like the military does !
Thanks. So, if I understand it, although the feds were in charge of coordination after the President's declaration on Saturday, command and control was still in the hands of the governor.