For as much as Lucas pimps the PT (and now the over all saga) as an "Anakin" story, why is it that the actor that played him never got top billing? Ever? Even for Episode III, Ewan got top billing.
You look at the OT and it is about, duh, Skywalker, and who gets the top billing? It is, duh, Mark Hamill. I say that the PT is about Obi-Wan.