Yes, but by adding the Diffuse node, you can connect grunge maps to that chip, as well as changing the color of the occlusion. For example, you have a figure covered in mud; change the chip color to brown, or whatever color the mud is. That occlusion will no longer be black.  If you look closely at my skull render, the occlusion is dark brown with the deepest recesses of the model shadowed in black, where light is not entering, but the shallow areas show brown.