Jordan is not, and never has been the land that the Palestinians were living on prior to the establishment of the state of Israel. Moving the Palestinians from where they were originally from, to someplace where they never lived (Jordan), is not something they are or were ever obligated to agree to.

The Palestinians never agreed to give anything up during the time when all of these promises were being made to the Jews who wanted that land for their own country. So they owe Israel nothing. Everything they have already given up is a concession.