I know someone who once worked on the show, not personally or anything like that, but this person said everything on Days goes through NBC's head of daytime as well as another suit. I think you're right about Sami/EJ being above the head writer's discretion - but considering the number of individuals involved, it's surprising nobody has vetoed that person yet! They do not improve ratings.
I think this pretty much confirms that NBC is the one calling the shots and that the head writer does not have complete control over storylines. Now I see why you dislike Corday so much Jason, he is a sellout. Instead of taking a hands on approach (either directly or indirectly by hiring someone that would report to him), he has allowed NBC to have complete creative control over the show which is very wrong in my opinion. They have run the show into the ground, tarnishing its legacy and turned it into something very different from what Ted & Betty Corday created.
This has me questioning even more why they bothered to renew it? Viewership has been on the decline for years now, its in last place in the ratings and more importantly they have done nothing to even attempt to turn things around and try and stop the decline in viewership. It looks like they are keeping it going just to use it to push their agenda. Case in point, Paulina & Chanel. These characters are NBC creations which is evident by the storylines they have been given. Paulina and her attempt to overhaul the town square and make it more 'inclusive' and Chanel pushing the gender stuff. If this is the direction the show is going in then I am not interested in continuing to watch. I am not fan of shows whose plots revolve around social or political issues of the day, I am interested in a show that has good characters and a good story line whose purpose is to entertain viewers not push some agenda.
Regarding NBC and their influence on characters/story lines, I wonder who is responsible for the following, NBC or the head writer:
1- Kristen having a more prominent role and becoming what I call an 'in your face' character (not in a good way).
2- The complete shift away from romance and traditional love stories (I believe women are the main demo for soaps and I don't think they are happy this aspect of the show has been lost. This might be a big reason why so many people have quit watching)
3- The weird obsession/focus on mental health related characters/plots. Ever since this head writer came on board, all we have seen is stories that have to do with people that are mentally unstable. Do TPTB find this entertaining because I don't and based on comments I have read many others don't either. Mental health is a serious issue and if they were doing a serious story about some character dealing with some sort of mental health problem that is one thing but they are just using mental health for cheap plot points.
I think the head writer might be the one behind these dumb stories, it looks like he loves this stuff as not only has he brought back characters who had mental problems (Kristen, Ben, Jan), he created new characters (Evan, Gwen) and changed the personality of several existing characters (Abigail, Claire, Gabi, Eve, Jordan) to suit his purpose. I hope we see a shift away from this kind of stuff because its become tiring and boring seeing the same type of stories over and over again. Unfortunately, it looks like these are the only kind of stories this head writer knows how to write.