Egyptian negotiations for certain refugees

Egypt accuses Israel of planning to push hundreds of thousands of Gazans across the border into Egypt. Some ministers are actually talking about it.

Egypt is stationing troops at the border to block this. How troops would actually do that is not clear to me.

It is hard for me to grasp how the movement of Gazans into Egypt would be importantly different from Egypt's taking over Gaza. And in either case, I see a potential for fighting between HAMAS and Egypt — both of which are oppressive governments, but in different ways.