Rocky:
Go ahead and name those “plenty of gedolim” who hold to vote. You can’t, because it’s not true. Joining the WZO has been forbidden across the board ever since Herzl SR”Y started that heretical organization.
It is also simply sheker to imply that it’s “only” Rav Aharon Feldman and Rav Malkiel Kotler who said not to vote. That remains the universally-held position of Klal Yisrael’s gedolim.