Weight Painting - Any way to add leftover vertices to selected bone?

Is there any way to add all of the vertices that are left with a weight of zero to whatever bone is selected? Or maybe a way to show the vertices that have been painted on by the other bones already? I have one bone that I want to hook up to all the remaining vertices in my model with a weight value of 1, so that when I move this bone it moves all of the vertices in the model. This bone is the highest bone in the hierarchy of the system, so I want to be able to use it as the main controller of the mesh so I’m able to move and rotate my creature without warping the mesh in any way.

Nevermind, I used the Select>Inverse button after selecting the vertex groups of all the other bones and then assigned them to the main controller.