There should be input from as many controllers as possible so that you get all points of view. HOWEVER! The union needs to designate a line controller who is in CHARGE of the changes and the program from the line controllers perspective. You don't need a thousand folks making decisions. You need ONE or TWO operational folks making that decision with the informed input of the membership...
We tried the bring everyone down to look at it with AAS. It doesn't work. It just confused the engineers <G>.....
regards