I’m not saying this is wrong. But if Egypt (hypothetically — because it’s not happening) occupied Israel, they would be right up at the edge of the Iranian zone of influence. It seems Israel is useful as a buffer that they know will not attack them without provocation, which they can’t say about other nations and proxy groups.
War plans for various contingencies in general are one thing.
A specific war plan for Israel means...what?
Egypt will do an unprovoked attack on Israel? Why? Egypt fears Iran.
They expect Israel to do an unprovoked attack on them?
Why would Israel do that, unless the Muslim Brotherhood gets power again?