The Dead Mixer wrote:
Regarding the demotions when Kirk took command, I think they were Kirk's call, not Nogura's.
In at least one draft, Nogura actually has the line, "It's a captain's command," which made it pretty clear that he's the one making that determination, or at least the one enforcing it.
Politics... It wouldn't surprise me if Nogura was so mad that he made Kirk take a demotion. Kirk, in turn, said that Decker had to take a demotion.