I've been doing some more Luneau video analysis, and I just noticed what appears to be another massive error on Cornell's part.
At this link, I watched the second, magnified clip.
Note the black, nearly vertical smudge labeled "D" in the picture below (you can use the Luneau bird "A" to orient yourself; please ignore points B, C, and E for now).
Twenty-three frames after the above screen capture, the Luneau bird aligns with the smudge labeled "D", so that Cornell "saw" a black head and tail that resulted in the incorrect sketch below (from Figure 2 of their Science paper).
I think the sketch above is a complete misinterpretation of our view of the Luneau bird. The sketch shows a "high-angle" view of the back and both upperwings of the Luneau bird; in reality, we basically have a "rear-view". We are looking at both underwings of the bird (with wings below horizontal).
I'm completely unconvinced that we have a view of the bird's back from this angle, and I think we have no evidence that the Luneau bird had white dorsal stripes.