ZD: “Amazing you could forget Rav Kook, It is true his zionistic leanings were not the majority and were a Daas Yachid at the time. He was definatly in those circles. I forgot exactly what, but he had something to do with Rav Elyshiv wedding (I think he was Masadar Kiddushin)”
I’m almost positive he was his Rav and Rav Shlomo Zalman Auerbach zatsal’s as well (at least one of them, if not both). He was also Rav Hutner, Zatsal’s Rav (or at least one of his Rabbanim). And I think he saved Rav Elyashiv, zatsal’s life somehow by getting him out of Europe or something. It is mentioned in the biography of Rebbetzin Kanievsky, zatsal.
Of course, I didn’t forget Rav Kook, zatsal. I wasn’t sure (and still am not sure) if he considered himself to be Mizrachi. Being Tzioni and being Mizrachi are not the same. That is precisely the reason that I wrote that I wasn’t sure whether or not there were any Gedolim that defined themselves as Mizrachi. My impression is that he didn’t, but again, I am not sure.