What the world's oldest eggs reveal about dinosaur evolution

This is true if we assume our conclusion.

Please explain.

Read again

Let me suggest you form your prior comment as an argument rather than as a statement of fact. It would help expose whether circular reasoning is present or not.

ETA: Ask yourself whether you are making an a priori argument.

Let me suggest that I am informing Michael of what an article on a web site says. Get a clue.

Yes, I was asking which aspect of evolution would be assumed to affect this kind of change. It seemed that natural selection would be the likely one.