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And he's "named" Darth Vader; "Darth" being a title also didn't come until later. Obi-Wan calls him "Darth" like it's his given name.

Pretty sure it was as much a part of planning the first episode as his later decision to have Anakin build C3PO. The early Star Wars scripts and materials are all over the map, there was no plan. This script just makes that all the more clear.

I always assumed it was written this way on purpose and thought it was a cool moment. Oh well.