All of TSR naming decisions for their various editions has mostly been based around screwing other authors out of their share of the credit and royalties. Including when Gary created Advanced D&D to screw over Dave Arneson.The book Empire of Imagination has a quote from Gygax about this on page 197. It discussed 2e as being a costly revision to the game's mechanics, which after the result failed to sell as well as TSR hoped Gygax was quoted as saying "to save 2.5 percent they wrecked the company", so it doesn't sound like he received royalties from the 2e era products.
TSR created some great games, but it was basically a-holes all the way down. Nobody should be looking to early D&D for examples of honesty and good leadership.