Success can put an individual in a difficult spot, especially in distance running where we tend to overanalyze everything. If he didn't win that ncaa cross title a few months ago or run that fast 5k, he would not have put as much pressure on himself and had sky high expectations from others. That's probably why he got injured.
He will bounce back because he has flashed brilliance. That doesn't go away forever when you're that young. He will learn from his mistakes which yielded an injury and come back with a vengeance, eventually.