Oh Shreck, and what about all the gedolim who were not against Zionism?
See the writings of R’ Chaim Berlin, R’ Yitzchok Elchonon Spektor, and most others, including the Agudah in Europe who voted for the Peel commission.
Furthermore, even if 100% of gedolim were against the State, that was a theoretical. It’s now on the ground and everything changes. You can’t pasken facts on the ground with theoretical.