This is interesting because it potentially refutes the idea that without Gary Gygax's involvement, D&D would never have come into being as not just a commercial product, let alone become as wildly successful as it did. I say "potentially" because, as a counterfactual, it's impossible to know for sure. Nevertheless, Rob, I want to ask if you can expound on what you've said here.
Specifically:
1) Had Arneson refined his game to the point where it was written down as a whole product (i.e. contained all the rules necessary for play), and said written product would be understandable to someone who had never participated in a role-playing session before?
2) If so, why did Gygax feel the need to rewrite so much of it (was it only due to personal jealousy, as you've noted previously)?
3) With both Don Lowry and Avalon Hill having elected to pass on his game, who was Arneson planning on demoing it for if Gygax hadn't jumped on it?
4) Do you think that Arneson's game, lacking any significant rewriting or editing from someone else, would have reached the same level of popularity and commercial success that Dungeons & Dragons did?