Are flightless birds a reversion?

Here's a story from LiveScience about a new dino-bird called Mahakala. Flightless, but tiny and ready to go.

Remains of a petite dinosaur reveal that some of the ancestors of birds had already shrunk in size before flight evolved.

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The dinosaur, a mere 2 feet long (70 centimeters) and weighing the equivalent of two cans of soda, roamed the Earth 80 million years ago during the Cretaceous period (between 146 and 65 million years ago).

Tiny Dino Was Ready to Fly | Live Science(Yep. Just another in a long line of discoveries that creos insist no one has ever found.)
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ArcherAll species are transitional.