Interesting theory. I do remember Lucas saying how disappointed he was with the reaction to Jar Jar, and how he wanted him to be the first fully CG motion capture main character. A title that Gollum ended up getting due to the obvious difference in character quality.
I don't doubt that Lucas wanted Jar Jar to be a more major character, but if this was in fact his plan, he went WAYYYYY too far the one way to give any legitimacy to Jar Jar being anything but comic relief, if that.
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