I've never seen a person change so much in just one year ..
On a serious note I always feel if it could b related to any health problems or stress in your life plays a major role too. I'm sure he has had hard time making some decisions regarding his professional life as we see and hear in news. Even minus the long hair , beard and oily look I can see dark circles more prominent around his eyes , looks more skinnier than before ...
I know we shouldnt b talking about his personal life but hope he's doing well. At the end of the day he's just human like all of us. He's a very talented actor. God bless him.