The majority of the damage is more than likely in the bottom end of the motor.
Bottom end components such as plain bearings for the connecting rods and the crankshaft main bearings are more than likely absolutely destroyed. Plain bearings rely on oil pressure to push oil in between the journal and the plain bearing creating situation called hydrodynamic lubrication where the surface of the journal is 'floating' on a thin film of oil between the journal and the plain bearing. Without hydrodynamic lubrication, which requires oil pressure, the bearing and journal will begin to degrade from metal to metal contact. Once these surfaces touch one another they begin to self destruct. In so doing, the crankshaft bearing surfaces for the offset and main journals are more than likely destroyed.
There is a distinct possibility that the engine cases are damaged as well. As the plain bearing for the crankshaft are destroyed due to lack of lubrication, the crankshaft can wear through the soft lead and nickel plain bearings and into the aluminum of the crankcase.
Oddly enough, the bore of the cylinder may be just fine. The piston and rings need splash lubrication and may have survived the event.
