I could only read the motive is ‘divide and conquer’.
If all the people are massed south they the people won’t be divided, only the land will be.
There is nothing suggesting the north won’t be annexed. Maybe the north will be cleared then taken over by military.
One of the Israeli government spokesmen Smotrich:
Far-right Finance Minister Bezalel Smotrich said that in a few months, Israel will be able to declare that it has won the war in Gaza. "What will the image of victory look like? Gaza is completely destroyed.[Gaza's] civilians will be concentrated from the Morag Corridor southwards to a humanitarian area where Hamas and terrorism are absent," and from there, the Palestinians "will start leaving for a third country. Our hostages will have returned home," he said at the Makor Rishon newspaper's conference on settlement.