Guys, not sure where you are getting your medical information from but this is not similar to, for example, a shoulder dislocation.
I am 90% certain there was significant ligament damage as well as a fracture of the tibia. Ankle dislocations of this sort are rarely not associated with structural damage although it is "possible".
He will recover but there is a strong probability that he will not be a 100% of what he was athletically prior to the trauma. If so, it will take a least a full year of recovery.
For all intents and purposes, this is more severe than a general ligament tear in the knee.