Syntax of either in either… or… sentences

I propose an analysis of either in either… or … sentences that relates to a broader generalization about the syntax all focus-sensitive operators. argue originates inside disjunction phrase, c-commanding leftmost contrastive focus. Then it is internally merged as sister phrase. Either copy may be pronounced. When appears higher than bare argument ellipsis has occurred second disjunct. This consonant with operators occupy two positions sentence (e.g. Cable 2007; Hirsch 2017; and Quek 2017). If this correct, then not only indicates operator, but also adds another data point universal generalization.