Tried to post when the Great Freeze happened so this may not even be relevant now, but here goes.
I wish I could be more helpful but my sub experience is with the older Benjamin Franklin Class ballistic missile subs back in the mid to late 80's and I was a nuke in engineering not a Missile Tech. I do know that to launch a missile certain things had to happen. Most you can prob guess. Coded message received, verified by CO/XO and nuke weapons officer. Battle Stations Missile was sounded (means entire crew was awake and stationed somewhere). A certain depth was attained and hovering maneuvers to maintain. Outer doors opened then missile launched. So you see this action would necessarily involve the entire crew. The only way a missile could have been fired from our subs would be with everyone in the chain (top (DC) to bottom(crew)) knowing and approving the action.