Ok, I was looking at tweets from Jane Espenson on Sunday. Here is one I found that sort of confirms that the Wizard was only a red herring.
Shannon O’Connor @ShannonOConnor0
@JaneEspenson haha was he just supposed to be Frankenstein’s monster? For a while we thought Doctor Frankenstein was the Wizard of Oz haha!
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28 Oct Jane Espenson @JaneEspenson
@ShannonOConnor0 That’s why “wizard” was in there!
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Keeper of Pandora's Box & The Yellow Brick Road.