my guess is that is it some sort of release button for like if you put a strap behind it... but other than that i have no idea... i'm kinda curious about it too...
I don't know why the button is such a "mystery", it's obvously for releasing whatever attachments they come out with for the Classical Controler. One that I've heard of is one where you can connect the Wii-mote directly to the back of the Classic Contoller. You would of course press the button to release the attachment.
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