James Hepokoski and Warren Darcy profess to be “resolutely agnostic” on whether the Essential Expositional Closure coincides with the descent of the ‘Urlinie’ replica in the newkey area of a sonata-form exposition. This paper investigates Schenker's published and unpublished sketches of sonata form expositions to examine whether or not it is necessary to be agnostic on this issue. The presented findings will pay particular attention to multiple readings and less clear-cut analyses.