I'm not sure that a gag order would have done a whole lot of good, unless, it would have included everything released due to the Sunshine Law, as well as keeping JB from doing interviews and press conferences.
With a gag order, that didn't prohibit the doc dumps, photos, jailhouse tapes, etc., the media would have still kept this story in the news. Every motion made by the defense would have been news. All the lawyers that worked with the defense would still have made the news, whether they were new to the DT or leaving the DT. Also, instead of hearing from JB directly, many members of the media would have done stories where sources inside the DT camp, or sources near the DT camp, would have leaked out information. JB would have had deniability, that he did not have when the words came directly from him on camera.
I dont' think a gag order would have stopped this trial from becoming a circus. I think there just would have been a whole lot of speculation as to who the sources near the DT was that leaked information was, and speculation as to the validity of the information that was leaked.
As always, my entire post is my opinion only.