The Invisible Enemies is a known issue and is currently a mystery to solve. The Enemies will not render on Scene Camera nor Game Camera. In some rare chances the Scene Camera will render; then soon after the Game Camera. I have tried a list of things in attempts to make the Enemies render during Gameplay. On the Enemy
Toggled Skin Mesh Renderer = No Results
Toggled Dynamic Culling Occlusion = No Results
Changed Layer Mask = No Results
On First Person Camera
Toggled Camera = No Results
Toggled UI Camera = No Results
Toggled Occlusion Culling = No Results
Changed Near Clipping Plane = No Results
Changed Far Clipping Plane = No Results
Changed Field of View = Enemies Rendered!
Tests that Work
Change Field of View (55 to 150)
Pulling Enemy(s) 50 meters away from Game Camera.
Update # 1
Changing FOV does not always work. Always works on value change from 55 to 150.
SOLVED
I have identified the problem. The Bounding Box attached to the skin model follows the ragdoll as it should. However, after the ragdoll is disabled, the Joints of the model do not return to its original position.