“How do they know the wolves killed the Mountain Lion and it didnt die of natural causes before being scavenged by the wolf pack.”
Good question. A healthy cougar that size would have probably killed at least one of the wolves and probably several of them before the pack could bring it down. These mountain lions are extremely powerful animals and will fight ferociously is attacked.
I speculate the lion was sick or injured and the wolves just finished it off. Otherwise, there would certainly be some wolf remains at the scene.
FWIW, pumas kill and maul hikers near suburban communities in So California on a regular basis. I think where ranching is involved that the ranchers should have the right to decide, with their guns, what kind of wildlife to tolerate in the vicinity.