As long as he only does the writing for the first game, there's nothing wrong with letting him near the thing. It's sequels that the guy should never be let near...
Sweet, my book sold! Hmm... what to write next. Ooh, the same story and characters a second time through!
Poor Richard just keeps finding out the ultimate badguy wasn't really that bad and that there is always a more cheesy iteration after he defeats the current one.