His arm strength is pretty damn good. Its not the best in the league but its well above average. His WO's at stanford consisted of a bunch of 4.7+ 40 running dudes who were not threats to beat coverage and go deep. I think with some NFL quality speed guys his arm strength will be a lot more obvious.
Oh I'm not saying he has a weak arm by any stretch, just there are more physically talented QB's than him, stronger arm, faster etc. But what makes him special is his understanding of what's happening around him.
Stanford was really slow but they did have Owosu and Ty Montgomery was coming on later in the year. But Owusu was hurt alot. What I meant about struggled on the deep throws is there were several in his career that he missed, overthrows, under etc. It was something Harbaugh talked about a few times when asked what else does a kid like that have to work on he'd almost always say he occasionally struggles on the deep balls.
I love the kid I would have given our entire draft, Kolb, Skelton etc for the chance to get him as a Card.