Gaon: Are you arguing that Rav Moshe’s Psak against an Eruv in Manhattan or Brooklyn would be applied by Rav Moshe to Radun and Mir as well?
YDS: Psak Halacha doesn’t work by counting (for majority or what not) seforim/sh”ut that were long lost but recently found, but were not considered by the corpus of responsa by the gedolei poskim of the intervening centuries.