chaim> Rabbi Shlomo Zalman Auerbach: “In the time of Rabbi Kook, the majority of Torah giants were ‘all as if nothing’ compared to him.
Here is second-hand info, but still interesting and going beyond nice statements that can be made just out of politeness or political necessity:
from R Lichtenstein’s hesped for R Auerbach:
Someone once told me that Rabbi Shlomo Zalman served as honorary president of the Jerusalem Institute. They once wanted to add a certain distinguished figure to the board, but he vetoed it. Why? Because he heard that this person referred to Rabbi Kook simply as “Kook,” without honor. A person who spoke like that could not serve. He would not yield until the rumor was proven false.