I'm not following this particular teenager's story, so I can't really say anything concrete about the accident details or his current condition. But I know people who've come out of serious injuries - waking up from a coma really is the first and important step, but then comes long rehabilitation work, and the results depend on a lot of factors: where and how he recovers, whether he has access to experienced doctors, family support. If you're worried about this guy - try to find official sources or groups where his relatives share information about his condition themselves, that'll be more honest than rumors.