The two individuals most suitable for the role of Workshop Facilitator would be:
A: Team Leader E. Project Manager
The rationale for choosing these individuals is that both the Team Leader and the Project Manager are likely to have the necessary skills to facilitate a workshop effectively. They are typically trained to manage team dynamics, guide discussions, remain neutral, and drive towards a resolution. The IT Operations Manager and the Marketing Director are parties to the disagreement and thus would not be appropriate as facilitators due to the potential for bias. The Software Developer is likely to be more involved in the technical aspects rather than facilitation.