One of the very old objections to Darwinism was that it is more complex than special creation. The number of changes required to turn a wolf into a whale exceed the amount of work one would have to do to make a whale from almost anything. It’s actually harder to make a submarine out of a car than it is to make it de novo or from whatever might be lying around. It is easy enough to image a submarine turning into a car, but once one starts taking the engineering problems seriously the story becomes more an more like an episode of Mythbusters.
But it’s hard to turn this into an in-principle argument against Darwinism since any pre-existing organs are more than none. It merely raises the familiar empirical question of how many changes are needed before they become prohibitive.