Your route is to rewrite the Mandates, all of them, and rewrite history.
Noted.
If the Allied victorious forces of WWI did not have any rights to any and all of the Ottoman Empire, than none of the other three Mandates are valid.
Goodbye Iraq
Goodbye Syria
Goodbye Lebanon
Now we can go back to the topic of this thread about the Arab Palestinians needing to move on and accept a Peace treaty with Israel in this day and age.
Exactly, all these countries were held in belligerent occupation by the League of Nations, which was just a tool by which Britain and France occupied the ME. In fact, go back two thousand years or longer and nearly all of the ME was held in belligerent occupation by one power or another continuously right down to the Ottomans. All of these League of Nations Mandates were just tools by which the Ottoman occupation of the ME was turned into the British and French occupations of the ME.
Belligerent occupation simply means captured in war, and when the UN was forced to dissolve the Mandate after the British decided it was no longer profitable to hold on to it, despite the recommendations made in the Partition resolution, the land belonged to no one but everyone laid claim to it. Egypt, Syria, Jordan and even Iraq all laid claim to it, and of course, the new state of Israel did, too, but the issue would be decided by force of arms among the peoples there and not by diplomats from far away places, and that is how it should be because there is no entity on Earth that can legitimately claim to have the authority to decide these issues.
When the war ended all the land was held in belligerent occupation, including Israel, since it was all acquired in war, but over time, the nations in the region began to determine the legitimacy of ownership as did Egypt and Israel and Jordan and Israel, and the rest of the land is still held by force of arms until some settlement can be reached with the other Arab nations. The only difference between lands held in belligerent occupation and those considered legitimate is that in the latter, the wars of occupation are more ancient.
To get back to the Jordanian capture of Judea and Samaria, when the Mandate was dissolved, in terms of modern history, no one had a greater claim to it than anyone else and Jordan's capture of it, painful though it was, was no more legitimate or illegitimate than Israel's capture of it would have been, and Israel's capture of that land years later was similarly neither legitimate nor illegitimate since these issues are never resolved by international law or by any international organization, but always only by the parties to the dispute. We do not live in a world of laws, we live in a world of myths about a world of laws, and matters continue to be resolved as they always have been by the nations involved agreeing to what they believe what best serves their interests, as was the case between Egypt and Israel and Jordan and Israel.
As for the Palestinians role in all of this, they have none. For thousands of years no one saw them as a distinct people with any rights at all, and if Israel were a Muslim state or a Christian state, no one would notice them today.