There are other indications besides the one you mention about the dinosaurs being closer to chickens. Chickens have a different path through the skull for the optic nerve. That same path is present in the dinosaur skulls. Only birds have hollow bones that I know of. Those that flew such as the
Pterosaur also had hollow bones. The pterosaurs was sort of a cross between bat and bird.
Something else interesting I find is that China is one of the best sources for finding these early creatures of the bygone ages of dinosaurs. There are places around the globe that are singularly far better places for finding such fossilized bones than others. China being one of the prime places. It's not the only one by far, there is some prime places in South America, North America, Russia, to name a few. But it seems that China has a gold mine in the sense of finding better quality bones and often turning up species we didn't know existed.