I'm flattered you think I rate.
Who's the decision maker? Well here's a quick lesson in television. The creator (Bryan Fuller) comes up with an idea and pitches it to producers (Dan Jinks and Bruce Cohen). They like the idea enough to sell it to a studio (Warner Bros) and then they pay everybody to make a pilot. At this point a pilot production crew is put together, including hiring a director. In this particular case, Barry Sonnenfeld. Fun fact, the pilot's director gets residuals for THE REST OF THE SERIES because he decided the "look" and "feel" of the show. (So David Nutter, who directed Smallville's pilot for instance is still making money off of Smallville, even though he only directed the first episode). Barry gets his name attached as an Exec Producer because it looks good when Warner Bros starts shopping the pilot around to different networks ( in this case ABC). ABC says "It looks great!" and orders a dozen episodes. Added with the pilot this makes the standard order of any show 13 episodes.
So then each episode becomes a collaboration. They write a script, then send it off to the Studio (WB) and Network (ABC) for notes, changes, legal S&P stuff (can't say that, can't show that, etc) until the script gets approved. Then they shoot it. Then the director turns in his cut to the producers. The producers make changes as they see fit and send it to the studio. The studio gives notes as it is their product they are selling to the network, one episode at a time. The changes are made and then it is sent to the Network for their notes and ideas. There is back and forth, if the producers feel that something should stay in an episode they will fight for it. other times the Network has its say. Working on OTH there were several times the CW wanted something changed, and Schwahn said "You bet!" and then never changed it. So it happens that way also.
Finally the Network approves the final show. They "lock" the picture, which means every edit down to the frame is approved and made note of when they cut the air master dubs and cannot be changed. Then they work on the sound on a mix stage for two days, drop the FX shots in and make air masters which are taken to ABC.
Then it airs and nobody watches and advertisers don't buy airtime and it gets canceled. The decision maker is some dude at ABC who makes $$$ a year that I never see or meet. The highest up I get is chatting with Bryan after I get him a coffee or saying hey to Jinks/Cohen when I drop off dailies or credits need to be signed.