The rockers and shafts are badly damaged. No, they did not run out of oil. If they had, it would be indicated by a change in color on the surface of the metal. What actually happens is there is no bearing surface and the two hard surfaces micro-weld themselves to each other then break loose and then repeat this scenario over and over causing a snowball effect until they look like these photos or seize together. Not a pretty sight!
If the stainless rocker were bushed with a bronze or "plastic" bushing they could live. It is also interesting to note here that many of the NHRA and other pro racers run aluminum rocker arms. Some of the import stainless rockers have bushings, but they have other issues.