unfortunately they have those credits on the origional pilot. I'm fairly sure thats the one that ends up counting, regardless of whether it airs or not, remember Tim has a writer credit on the train job, but only Joss 'created' Firefly as he wrote Serenity.
Yes but they didn't throw out Serenity pilot and write a new pilot that completely alters every single aspect of the show.
Like, if ABC, had decided they didn't like the pilot for Lost. And they smoked a lot of crack and decided they were going to hire me to rewrite it. So I keep Matthew Fox because I used to have a crush on him and I keep the LotR dude because he brings in the big fanbase but I decide that, instead of a show about people stranded on a desert island after a plane crash, I'm going to make a show about some guy who runs the Lost and Found desk at one of those Swim with the Dolphins places.
I think that the arbitrators would find that I had altered the framework, setting, theme, premise, central characters and tone of the show significantly enough to get me a created credit.