I'm glad someone said it, reading people talk about palaeontology or taxonomy with literally zero idea of what they're talking about it just mind-numbing.
If what's being said about Zolt is true, then it's likely based on one of the first avian dinosaurs I suppose. Though that feels like it's crossing a bit close into Archeops territory.
Also, isn't the arcto fossil called the 'dinosaur fossil'? Which makes no sense since there's no marine dinosaurs. So don't know how well these fossil translations can be trusted, could be wrong.