why is it an advantage that you are an external change agent and not an internal change agent?

The unit is Managing Change.

Task:
An employer of a large organisation has engaged you as an external change agent to consult and manage the change process within their organisation. The client (employer) believes they have identified the problem; however, employees perceive things differently. This presents a dilemma.
Answer the following questions considering this situation.
1. In this specific scenario why is it an advantage that you are an external change agent and not an internal change agent?
2. What are the 5 kinds of activities that change agents must carry out when planning and implementing change? Considering the above scenario, at what stage of the process do you anticipate there might be difficulties in implementing change in this organisation?
3. Outline and discuss the role of diagnosis and feedback in the process of organisational change and how it might be achieved effectively? Use examples to justify your answers.