What would characterize a 'strong arm?' Is it distance? Velocity? How far would a QB have to be able to throw in order to have a strong arm?
Good question really. Though who else remembers when Sam split Danny's palm with a pass? Does that in any way characterize a strong arm? To me, when I see the guy just kind of flick a pass out there and it comes off like a rocket, I think he's got a pretty strong arm. Are there stronger arms in the NFL? Probably. But I don't see that as being any kind of a weakness with Sam.
The other observations I can get behind. He is a little weak on awareness in the pocket and does seem hesitant to throw the ball that forces his receiver to outplay the defender. He also needs to stay on the field. I wouldn't call him injury prone but another one where he loses playing time could put him in that category.
To me - one play really demonstrated the strength of Sam's arm. That play when he was rolling left and just before going out of bounds, he flicked a pass back to Kendricks in the endzone. Going back away from your body while moving hard to your left is a pass that requires real strength in order to be accurate. And that pass was not only accurate but had pretty good steam on it.