> I'm afraid to say this but if you have seen a production
> where zach is never seen it is wrong.
I saw the national touring company at the Fischer Theater in Detroit back in the late 1970's.
At the point you're talking about, Zach did come down the aisle far enough that I knew where he was. However, he never got on the stage and never got into the light enough that I could see his face. (I suppose that people in the first couple rows, who were still in front of him as he faced the stage, may well have been able to see his face; the vast majority of the audience could not.)
So if you interpret my comment about never seeing Zach to mean that I never saw even a shadowed silhouette of his back ..... then, yes, that is incorrect and I stand corrected. However, in terms of seeing his face and attaching any peronal *character* to that voice in the back of the theater ....... No, I didn't.
I could have shaken hands with the actor who played Zach in the lobby on my way out of the theater and I would not have recognized who he was.