I hope for two things 1) that he fully recovers and 2) we finally get to hear the record they made before he was injured. There is an unreleased record out there right?
A full recovery I can't see happening, unless you mean full ability to talk/move. A family friend of mine was thrown from a moving car by her abusive boyfriend at the time and she is PHYSICALLY perfect, mentally not even close and they don't think she will ever be 100% unfortunately. She has the mentality of a Junior High kid, and a really bad attention span. Sometimes pauses when talking because she can never remember what words are and is always thirsty so she has to be monitored and kept from drinking to much (water, juice, etc) so she won't drink herself to death.
I really hope Chi gets close to full recovery, but god is the brain a weird thing.