Evolution has been held as "true" for a hundred years now, even without the "evidence" which was observed just this past June. The desire to "prove" this theory leads to biases and the strong desire to fill in the gaps of their theory. I suspect what this grad student observed isn't what they think they've observed. They've seen a change, but it's still a fly. Creation doesn't discount the possibilities of differentiations on a theme.
You think that's the evidence for evolution? That's it? And like any other evidence I could show you, you'll wave it away and say "creationism could have done that too." So why do you bother even thinking about the evidence? Well, from your knowledge of what evidence exists, it's apparent that you haven't thought about it. And don't want to. That's okay. It puts your comments in perspective.