Huh, I hadn't heard that, though, it only justifies my tithing to the Church of Whedon.

Though, the way I understand how they do writing in Hollywood is that any number of writers can look at a script/screenplay, tweak a few words, and get credit (provided they use a portion that they worked on). There's a Kevin Smith video somewhere where he's talking about work he did for a failed Superman movie script (that I can't very well track down at work) that sort of reflects this process (and how it is pretty messed up).