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.
If you define homology as resulting from common ancestry, you can’t then turn around and use that as an argument for common ancestry.
Tiktaalik discoverer Neil Shubin from the University of Chicago searches for genetic clues between fish fins and tetrapod toes.
That’s the way it is, universally, with creative invention.
Complexity (such as we see in a pile of autumn leaves) can arise spontaneously from unguided natural processes, but complex specified information cannot.