But it might be more profound that that.
But my claim is more simple. If all we had would be Reb Moshe and Reb Aaron Kotler that would be enough to establish the law.
My own feeling about this subject is mainly based on the little bit of reading I did about Jewish Communities during the Middle Ages. [That is in the Teshuvot of the teacher of the Rosh Rav Meir from Rotenberg]. Still there are troubles in Israel because of the Sephardim trying to get rid of the Ashkenazim. Not all but enough to make it worthwhile to be aware of this problem.