On one issue, Spinrad's memory may be a bit a faulty... perhaps even intentionally so. Spinrad was asked several years back about the James Blish novelization of "The Doomsday Machine," where Decker doesn't die but instead survives to tell Kirk rather lamely that will resign/retire after repeating his 'error in judgment.' Spinrad claimed that Decker's suicidal death was in every version of the script, all the way from the first draft Spinrad submitted. I accepted this on Spinrad's word, having read in various places where Blish, having only early draft scripts to use to create his novelizations, would make changes to stories on occasion to resolve story problems in order to have "his version of the episodes" make sense. But I never could understand why Blish would erase Decker's death; what possible improvement to the story would that plot change bring? Fast forward to the Season two edition of "These Are The Voyages," which credits Gene Coon with adding that plot point in one of the later re-writes, reflecting Decker's death wish mentality and further stating that the new twist served the double purpose of giving Kirk a clue as to how to defeat the planet killer. So what's the truth? From my dispassionate viewpoint, I lean towards giving Coon the credit. Cushman had copies of the draft scripts, in addition to memos between Coon and Spinrad. There's no reason I can think of why Cushman would want to switch credit to Gene Coon if the documents didn't support that. However, there may be a reason that Spinrad might not want to give Coon credit for such a major change. Turns out that Spinrad was furious with Coon for re-writing Spinrad's next story submission, "He Walks Among Us." Spinrad wrote it as a very serious piece, and Coon completely re-wrote it as a comedy. Spinrad ended up appealing directly to Gene Roddenberry to not produce the story if Coon's version was to be used. GR in fact did as Spinrad requested, and the story was never produced. Spinrad wouldn't be the first writer to hold a grudge for decades over a re-write he felt ruined a good story of his. For a great example of that, Google "Ellison, Harlan."