Unexplainable companion wether's death

Two days ago I found Burgess' companion in the bachelor field, dead in the shelter. He had no external injuries and since we did not perform a necropsy, I do not know if there were internal injuries or defects. Vinnie was a twin born here this May. His sister had physical abnormalities and died within 2 weeks of birth. Although his conformation was poor, I felt he had adjusted well to living in the bachelor pen.

Without a buddy in the field, I will move Burgess into the pasture with the ewes earlier than planned. My sheep texts recommend that sheep do not live without companions since they have a strong herd identity.