Early Dinosaurs Thrived by Becoming Bipedal?

A recent news article discussed research on how dinosaurs survived the end-Triassic/early-Jurassic mass extinction. Researchers looked at two clades, the clade Avemetatarsalia, which includes dinosaurs and pterosaurs, and compared them with Pseudosuchia, which includes crocodilians and their extinct relatives. They discovered that only a few pseudosuchians survived past the Triassic-Jurassic boundary, but many of the pterosaurs and dinosaurs flourished past that boundary.

So how did dinosaurs an...