It's been about 14 months since his original concussion(s). Without knowing more about his situation, you'd have to think that he's putting himself at risk by getting back into game (or simulated game) action. Interesting note: Crosby said his recent treatment for his neck issues has resulted in a "significant overall improvement" in his symptoms.

http://www.theglobeandmail.com/sport...rticle2360281/