In your second picture, the differences in pelvis morphology is very striking. If you group them into two groups by shape you must group the chimp pelvis by itself and the other two together.
In fact, the first time I taught
Introduction to Physical Anthropology I was warned about possible creationists in the class. On the first day I brought in a human innominate (half the pelvis), an
Australopithecus innominate, and a chimp innominate. I asked the class to arrange them into two groups, and they all agreed that the chimp was the odd "man" out. I had no problems with creationists after that. Of course, this was a few years back.
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