Can Sidney Crosby come back at all this season since going down with a concussion/s (1/1 and/or 1/5/11) and...?

...suffering from post concussion syndrome (1/6/11) ever since then. Especially, he was on the ice in full gear for about 15 minutes prior to the team full practice. According to the team's official website, he stickhandled around some cones and shot a few pucks. Prior to this development he was doing functional rehab for the past mo to 2 mo now. At the same time hes not the only Penguin whom is dealing with all of this as well. The question also applies to other hockey players and other players in other sports as well. The questioner isn't even a fan of his or Penguins as well. But just been following all of the him because of his concussion/s and post concussion syndrome.