It's too early to talk about him playing pro. He still has 2 years in college before he can even think about turning pro.
How long ago did you see him play in juniors?
Klahn has grown a lot as a player over the last year or two, his shots are more powerful today than they were a year ago, and it doesn't look to me that he goes for broke. He seems to be pretty patient in rallies most of the time, and attack the short balls.