What is evidenced by the presence of rudimentary hind limb bones in a whale?

The presence of any rudiment in any organism indicates evolution. In whales, this indicates that they are descended from another animal. It cannot be argued that the ancestors of whales had developed limbs. Perhaps they were used as auxiliary parts of the body, or were not used at all. This is the same as the tailbone of a person. The tailbone is a rudiment. It indicates the presence of a tail in our ancestor. But this does not indicate the need for a tail from the ancestor, since in the end he lost the tail.