Assistant coach out of box?

[bullrider]

With the new enforcement issues surrounding the coaches box, I was wondering about the expanded role of assistant caoches...

Is there any rule stating that an assistant coach needs to be at the "head" of the bench (e.g. inside the box as well) or is it permissable for an assistant to be at the far end of the bench (thus being closer to call out plays, yell for screens, etc.)?

They are clearly out of the box, but since they are sitting, is this legal? Does their location in any way effect the head coach and his use of the box?