Hospital? Any scars Grey had were dealt with by one of the elders. A hospital was a vague concept.

Left to his own devices might mean that Grey became entirely feral.

Either way, he sat, slumped low in his seat, dirty, smelly, and injured. He dragged his eyes up to look around, to take in the train, the people, what was outside the windows. He hadn't dreamed much on the train. Maybe this was a dream.