Health, so are all of the gedolim you have previously mentioned. I will, however, mention a few who are still alive (ad 120). Rav Dov Lior, Rav Nahum Rabinowitz, Rav Shmuel Eliahu. If you want opinion of a Chareidi gadoil see Mishne Halachot 15:213.
AY,
1. I dispute your claim about the majority of the gedolim. In any case, gedolim are not Hashem and can err. They erred when they told Jews not ot leave Europe.
2. Actually the killer was Avraham Tehomi. However, he was (so he claimed) sent by Ben-Zvi/
3. Chaim Weizman had already reached an agreement with Abdulla’s father Faisal in which the latter enthusiastically supported the idea of a Jewish state.