Generally on lightweight tandem aeroplanes, the student, or solo pilot, are generally in the seat furthest from the permissible CG range, and the "other" seat which can be either occupied or empty is the closest to the CG range. Which is front and which is back varies between aeroplanes.
Photographs of Stearmen on the interweb invariably showing solo flight from the rear seat. The rear seat is clearly the furthest from the 25% chord line, and so the furthest from the CG range.
So, whether TCT is the captain and EG is a passenger, or TCT is a student and EG is her instructor - TCT would still be in the rear seat.
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Last edited by Genghis the Engineer; 14th Oct 2016 at 18:22.