Competition for the design/build of a significant building is intense. All teams are trying to get whatever advantage they can, so being able to communicate your message, your process, the ideas, and your team in a seamless way is critical.
Design/build projects are particularly difficult to pursue because there can be such a clash of cultures between the architect and the contractor. They tend to think of the project in different ways, and it can be tough to get them on the same page. In this case, the architect and contractor both knew they would have a greater chance of winning the project if they brought in someone from the outside to help them unify the team.