A question I would have, not knowing much about the nitty gritty inner workings, is even in the best case scenario where a second tail happens to form and technically have the right nerve and muscle structure, would it even be able to move the tail? A brain is set up to send certain signals to move the body in certain ways, as I understand it. If it isn't set up to recognize a second tail, would it even be able to send it signals for movement? I guess best case both tails might just pick up the same signals and move simultaneously? I mean granted it's not exactly a prehensile tail's worth of control, but it still needs the right signal sent to move it, right? Hmm...
Anyway, interesting article. =D