Is Caesy Hartley Eide??

I'm confused. When Eide chases the band, the elevator nearly kills him, removing his hood. It seems that Eide is a cat. Could Eide be Casey Hartley?? When Casey Hartley was missing, his lost poster showed that he had no hair. Maybe his hair grew in the mines?? Mae also described Casey as tall as her. Maybe he grew taller?? It also depends when Casey went missing.