Wishmaker

This idea is a little out there, but I had a thought that perhaps El's title was given to Ba-Ado-Mishram. Since El presumably has not been back since before the false desolation, he would not have known what transpired during the false desolation. My thought was that during the false desolation, with Honor losing his sanity, a bondsmith went rogue and messed with connections on Roshar. This idea started by trying to think of a reason why El cannot hear the rhythms. It could be because because he is supposed to connect to the singers. One leap further into crazy theory world is that Ishar manipulated a human as part of his experiments and turned a human into a spren, leading that human to become Ba-Ado-Mishram after the human-spren monstrosity tried to take vengeance.