Dan,
I think you and Arizoni just differ in what the "sprag" or the "sprag clutch" means.
The sprag (or sprag clutch) is Part #11 in the Hitchcocks exploded view, not the gear at the starter end of the gear train nor the gear train.
Am I right? (ducking down)
Yes. The sprag clutch is part number 11 in Hitchcock's drawing.
http://www.hitchcocksmotorcycles.com/partsbooks/pages/4688/Drive_Cover_&_Sprag_Clutch_AssemblyThe "sprag clutch" is the assembly with the sprags that wedge between the drive and driven surfaces in it.
In the case of the AVL, one of the gears (#13) has a surface on it that drives or provides power to the sprag clutch sprags.
The other gear (#9) has a surface on it the sprags wedge against to drive it thereby powering the gear to drive the next gear.
In order to operate, the sprag clutch and both gears are needed.
(For those that don't know, a sprag clutch is a device that transmits power or runs free depending on the speed of the driven and drive surfaces.
If the drive surface is trying to run faster than the driven surface the clutch sprags lock up wedging themselves between the two surfaces.
If the driven surface is trying to run faster than the drive surface, the sprags "lay down" and release their wedging action and allow the driven surface to freely move faster.)