You need another "helper" bone that doesn't have any geometry assigned: abdomen or waist (I dont know the name of the first bone above the hip in TY's case). It should have exactly the same joint parameters as the abdomen/waist bone of TY, just as the hip does.

Actually, the easiest way to rig the tail is to use TY's rigging as a donor. Remove all bones above the abdomen, add your own tail bones to the hip, then delete the right and left leg bones. Result: a perfectly conforming tail.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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