Disaster Index: 6.8 Entry: Ferguson Dependency, Pre-Brazil Cause: Scotland's midfield architecture in the Brazil fixture resting on the condition and continued availability of one player whose influence has no documented replacement within the current squad. Category: Structural / External Dependency Evidence: Ferguson identified across the campaign as the primary midfield organising presence. Brazil fixture represents the highest-pressure environment Scotland have faced in 28 years. Single-point-of-failure systems perform differently under maximum load. Historical precedent: Scotland's capacity to build tournament campaigns around one irreplaceable midfielder, then discover what irreplaceable means at the decisive moment. The record is specific and has been kept. Affected parties: The midfield unit. The defensive shape that depends on it. The part of the country that has started to believe. Immediate outlook: The player is fit and selected. The Index records dependency, not injury. These are different problems. One of them has already arrived.