Of course it is true that the Zionists lobbied the British Empire to assist in the creation of the Jewish state. It is no secret. However, you're extending this too far so as to mean as if Zionists controlled the actions of the British Empire. That is, by no means, true.
You have accused Weizmann of not obeying by the treaty conditions. Did the treaty envision the anti Jewish massacres that occurred throughout the 30s? Did it envision that Arabs would reject the Peel commission plan in 1939, where Jews were to be allocated the land which they
purchased on their right? Did the treaty envision that 5 Arab countries would attack Israel in 1948 and Israel would've to defend itself desperately? Where did the friendship go?
As you said before, the treaty went void later on as circumstances changed. My point in bringing the treaty was to show you that Jews didn't "displace" the Arabs, as you previously claimed. It was, if we view from the perspective of someone living at that time, voluntary arrangement.
It's late night here, I'll retire for today. We'll continue this some other time, bro. In the meanwhile, if you have time, do read the link I provided before (although this is a jewish source, references are provided in all cases.):
Myths & Facts Online: The Mandatory Period