That's an awesome trailer.
The problem with Gonzo, I think, isn't any of the size or eyelid concerns. I don't mind the puppets changing over time, that's part of the deal. But it is precisely, the 'magic triangle' issue. He always looks crosseyed, and as such doesn't look 'alive'. His gaze is lost somewhere in space in a way that doesn't happen with the magic triangle. Since it's impossible to get eye contact with him, he doesn't appear real. That's probably been said here before, but I suppose it won't hurt to say it again.
They're both awesome teasers.