I don’t know anything about dinosaur fossils, but I can speak as a food scientist who specializes in matching competitors products there is so much information specialists can glean from seemingly irrelevant or useless data. If I have an ingredient statement and a nutrition facts panel for a sauce or other food product I can create a formula that is 95% of the way there without even looking at a control sample. Like others have pointed out fossils can provide nerve innervation points, blood vessel connections, diet, and overall size of a dinosaur by comparing to other fossils and their understanding of material science. Paleontologists are talented scientists!