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"hairs" in ornithodirans

burden of proof to dismiss primary homology (and secondary) would lie
in those who say these "hairs" are not homologous to other
ornithodiran hair, protofeathers and feathers.<<

Why choose one character, like a dorsal fin, or an extended ilium, or an 
abbreviated tail, to propose homology, when you have a complete anatomy that 
can support or falsify a relationship hypothesis?

First demonstrate that pterosaurs and dinosaurs are such close sister taxa that 
no other taxa are closer, more parsimonious sisters. Then the hair homology 
will simply be one more character in a suite of synapomorphies. 

If not, then you have convergence.   

David Peters