At first when they first showed that trailer, it was never revealed that Kiefer was even doing the voice of Snake yet. That was reveals months later. So, I figured "ok, that sounds like Kiefer". Then he's announced, and i'm thinking what about Kiefer? I'm not sure if the medic has any relevance or not. Why edit his voice when Ishmael sounds identical to Snake? Maybe that's a change in the final version of The Phantom Pain as well. Going to be a very interesting year as we wait. I can only imagine E3 to give away a little more facts as well.