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Re: Theropod herbivory - parallel evolution or one clade?

...and I wondered if it was any relation to the Therizinosaurs, or if it
represented an entirely separate attempt at the development of theropod


That's an understatement. Since its description everyone seems to agree *Incisivosaurus* is the basalmost known oviraptorosaur. The oviraptorosaurs and the segnosaurs seem to be each other's closest relatives, so there is a relation.