I can refer you to Dwight R. Heinmuller's excellent book series, "The Greatest Packards of Them All" Specifically Volume 2, "The Proposed 1957 Packards", which covers the design and development process of both the proposed 1957 Studebaker and Packard lines. These books (which I highly recommend) were written in 2022 and list over 100 contributors to the effort, including Richard Teague, Virgil Exner Jr., Bill Schmidt and almost all of the S-P styling staff in both Detroit (Packard) and South Bend (Studebaker) - so these men know whereof they speak. It was entirely normal for the design chief - be it Teague, Exner, George Walker, Harley Earl or especially Raymond Loewy - to see that THEIR NAME went on anything produced by their corporation. Again, in any case, your puzzle, your rules. Thanks for posting the puzzle of an interesting car that I happen to have a wealth of authoritative information on in my collection.