Why is the communication management plan not an input to plan stakeholder management? Wouldn't you often appoint specific people to communicate with specific stakeholders ? It happens at my work all the time...issues have to go through the proper channels, and often communication with stakeholders is reserved for whomever is closer to them in the channel.
regarding your question, the first input to stakeholder management is the well known commonly used input "Project management plan" which by definition includes all other subsidiary plans including the communication management plan. hope this clears your confusion.
reference: check section 126.96.36.199 from the latest PMBOK guide version. It describes why the Project management plan is an input to the stakeholder management, one of them is "Need and techniques for communication among stakeholders".
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This interview with Simona Fallavollita (LinkedIn Profile) was recorded at the magnificient Project Management Institute (PMI)® Global Conference 2017 in Chicago, Illinois. We discuss the how, what, why and when of the changes that are coming to the PMP exam.