Dr. Awkward said:Godzilla is not a mammal. Big Bird is not a mammal. They have "not being a mammal" in common, and so for the purposes of argument from analogy, Big Bird is identical to Godzilla.
Or perhaps analogy is more than just linking together two unrelated concepts by virtue of trivial similarities.
Certainly, we should focus on the non-trivial similarity between Big Bird and Godzilla.
As Harry Knowles (of Ain't It Cool News) would say::
MANINSUITMANINSUITMANINSUITMANINSUITMANINSUITMANINSUITMANINSUITMANINSUIT!