Thanks for the post. I have a suggestion listed below which has been helpful on multiple projects for me in the past. I would also recommend the Business Architect essentials course on the PDN if you have not taken that recently.

Suggestion --> Provide the team a simple Visual Specification Map that tie the specifications to something that is easy and quick for the team to understand. For example, create a visual that shows how the specifications link to the business process, specific business scenarios, user scenarios, major features, etc you are trying to implement. Depending upon your situation you may be able to do this linking and create documentation directly from Pega yourself or with an SA from your team. In other situations, it might be more appropriate to start with a picture in Visio or Powerpoint to help get the team grounded. Referring the team to these types of visuals has been helpful on multiple projects that I have worked on both at the Initiation stage as well as during project execution.