I would say it is normal , the reason for crosshatch on the cylinder walls is to file the rings to fit the cylinders , the cam has Parkerizing coating & it wears away as well , also some brg material is worn away , most of this is washed down as the oil returns to the pan & drops to the bottom , the reason you run the engine at 2000 RPM for the first 20-30 mins is to keep enough oil on the cam being spryed up from the crank & running down from the heads , at idle there is not enough oil flow on the cam .