The re-usage of highly similar and complex parts in widely different organisms in non-treelike patterns is best explained by the action of an intelligent agent.
Darwin began casting around in his mind for supplementary theories, sometimes going so far as to reconsider evolutionary thinking he had once firmly rejected.
If you define homology as resulting from common ancestry, you can’t then turn around and use that as an argument for common ancestry.
That evolution, over a span of 11 million years or so, was once hailed as a “poster child” for the confirmation of Darwinian theory.
Darwin asserted the “absurdity” of evolution designing a shared opening to the esophagus and trachea (windpipe).