Motion seems to be greatest in maniraptoriforms, and more restricted outside that clade.
However, barring magic or genetic tampering, novel structures had some morphological precursor, which may indeed have had a different use. Reanalysis of their model, however, could concievably show that the numbers do not add up, but that hasn't happened yet. Opinion of a model and fitness of a model are two separate issues, and subject to different types of validation.