Even though jesus uttered the words "I am", with nothing "in particular" following it, and thereby saying it in a way that would resemble Gods name (just saying "I exist") wouldn`t necessarily mean that he was saying that he was God. Also, Jesus never said "ego eimi", he said it in aramaic, which is a kind of a hebrew dialect. So I wonder: What did Jesus REALLY say? Did he say "I am Yhwh"? I don`t think so. If he did, there would have been no discussion on the matter, whoever wrote the gospels would have made it perfectly clear that Jesus claimed to be God.
There is another solution: Jesus could have simply been quoting the scriptures. He was probably familiar with the OT texts (after all, as a young man he taught the students outside the Temple). By quoting scripture, he could have been emphasising that he was sent by God, and he was "reminding" people about this. I ... doubt "ego eimi" means the same as"Yhwh", although I thought so for a while too. I`m not sure, though... But what did Jesus REALLY say, in aramaic, THAT I would have liked to know.