Comment on Watchful by Eurwentala
I didn't even know about the other oddities you listed apart from its head. This animal looks so unlikely... fix a broom handle to any living animal today and see how they manage. It's a wonderful depiction you did, thank you for sharing.
The crst is pretty thin, and would be rather light: it's assume to be hollow. It's the arms that are ridiculous, because they seem to impair whether it could walk quadrupedally at all.
I still imagine the normal stress on the crest through movement would have been immense. And I just followed your link in an above comment to your Sebulba Nyctosaurus. Amazing. Albatroses have nothing on these guys. They're in a way like inverted penguins... and surely the star in every comedic animal documentation.
We underestimate pterosaurs so much. Several people have been head-scratching over the disproportionate wings and legs, and had to conclude that no matter how reasonable quad walking is for pterosaurs, at least nyctosaurs are doing something different when terrestrial. Maybe as ungainly as a loon on land, but nonetheless capable.