But the whale’s “regular” front flippers don’t have those bones found in the vestigial hind limb.
The bones found in the vestigial hindlimb of the whale are like the hindlimb bones in other mammals, even those with hind flippers like the Sea Lion pictured in my earlier post.
Also, have you ever wondered why the front limbs of whales have that pattern of bones, with one-two and then several individual “digits”?
.its possible that the whale ancestor had an extra pair of hind flippers. so in this case it will not be evidence for a common descent but for vestigial flippers.
Your analysis is suspiciously superficial. Merely calling them “extra pair of hind flippers” does nothing to explain why they would even be there, nor the particular features they have.
Here I have compared them to the bones found in the hind leg of a cow:
I am certainly no comparative anatomist, but even to my untrained eye it doesn’t look like the bones of another pair of vestigial front flippers to me. And if they’re vestigial hind flippers, then they are clearly homologous to the hind flippers of a Sea Lion, and even homologous to actual legs.