There was some talk that he wanted to go back to school, so I'm not surprised. But it's a shame, I really liked him and thought he had the potential to become really good.
Most logical would be that he would go to school. He is too young to join the military service. And looking at the date he stopped posting stuff on his twitter makes it look really obvious that he wants to return to studies.
And why I use this as an arguement is that most pro gamers who got a team related twitter account stop posting on there after either leaving or retiring. In this case retirement
That's too bad. I hoped for him to get more good results after the HSC he participated in but was always disappointed when he hadn't qualified for this or that event.