I hate to throw a spanner in the works but can I put two more names in the equation......Claire MacKichan and Erhard Schnell.Sven said:
As far as I was always aware Chuck Jordan was the Director of Styling but MacKichan sowed the seeds in designing the Monza GT of 1962 and Schnell created the first drafts of, Project 1484 and that became the Opel GT.
Ultimately Jordan provided lead the team but Schnell is possibly the man we should thank.