Premise: Rabbi Dovid Povarsky (Hebrew: יהושע דוד פוברסקי‎ "Yehoshua Dovid Povarsky"; 1902–1999) is known for his erudite Talmudic lectures and his deanship as Rosh Yeshiva of Ponevezh Yeshiva. He was asked by Rabbi Yosef Shlomo Kahaneman to join the previous two heads of the institute, Rabbi Elazar Menachem Shach and Rabbi Shmuel Rozovsky to create a triumvirate in leading the Yeshiva.
Hypothesis: Yosef Shlomo Kahaneman was a former leader of the Yeshiva.