Thanks for explaining how the script is the bible that cannot be changed. You hear all the time how scrips get rewritten on movie sets. I didn't realize that was not an option on tv. Although I just read a behind the scenes book on Game of Thrones, apparently Jonathan Pryce changed a couple of words in his first scene. Someone asked the director is he was going to ask Jonathan if he was going to say his lines as written, and the director was like hell no. He was not correcting Jonathan Pryce on his first day on set. And you know what. Pryce made that scene better.
So it really sucks that new writers really didn't know the show and gave no crap in learning its backstory (yes I heard the story about writers being advised to watch old shows while they were cleaning.) These actors know their characters inside and out. Canon was ignored which is why I stopped watching. It's no wonder Jensen wanted out.