I don't have an answer for Ioana's final question, but this question did get me thinking about the relationship between speech and the other, or, more specifically, between the term I and the face. Both of these cases seem to represent universal individuality. We learned how I, when spoken, refers to one specific person, a self-reference. Yet at the same time, everyone can use the exact same term, I, in reference to themselves making it mean something different in each case. I think that the face as a marker of absolute otherness parallels this example of I, yet in reverse:

Everyone has a different face, no matter what race, gender, etc., no two faces are exactly the same (I suppose we could get into the cases of identical twins, but let's not). However, each of these individual aspects of the self represent the other, a universal concept outside of oneself.

I think what I'm trying to get at is that while the term I represents a universal individuality, the face represents an individual universality.