Monday morning, one engineer was out on PTO and three separate workstreams were already blocked before lunch. Slack filled with "quick question" pings nobody else could answer, and standup turned into a scavenger hunt for missing context. By Wednesday, it was obvious we did not have a throughput problem ... we had built a system that stored critical knowledge in one person. Most leadership teams do not call this out when they see it. They call it excellence: "She is our strongest engineer," "He just knows the platform better than everyone else," and "If anything goes sideways, bring them in." I have said every one of those lines in my career, and I have paid for each one later. What stalled us was not coding skill. It was missing map data ... why certain decisions existed, where hidden dependencies lived, and which changes looked safe but would actually blow up downstream. The team was talented. The system was fragile. If you have read The Phoenix Project , you already know this pattern as the Brent Effect.…