Why did David Gillette include bones from Diplodocus and Apatosaurous when he analyzed his results?

David Gillette included bones from Diplodocus and Apatosaurus in his analysis to provide a comparative framework for understanding the skeletal features and evolutionary relationships among sauropods. By examining these well-known specimens, he could draw insights into the anatomical variations and adaptations that characterize different species within the same clade. This comparative approach enhances the accuracy of his findings and helps contextualize his research within the broader scope of dinosaur Paleontology.