I know some guys like Cutler have a cannon, but he's a perfect example of relying on that physical gift and it results in sloppy plays and turnovers.
Then take Peyton - who has a WAY less on any ball he has ever tossed. Heck, I was talking with him one day and he even admitted his arm strength was below average, and said that Eli without a doubt possessed way more of the natural throwing talent. It also meant that as he grew up playing he keyed in on his touch and accuracy as well as being forced to go thru his progressions as he wasn't so brash about his ability to sling it into really tight windows which often are really just try to force the ball in and not the smart read or play.
What I didn't know was just what a howitzer that Kaepernick does have! JESUS, MARY, & JOSEPH!! Here's a video posted on YouTube of him firing a couple passes, with one distancing itself at 264 yards.
* note the throw is from an elevated position but I have no clue how to adjust what the throw would be if on a level playing field. I have to imagine it still means he can essentially get the ball from end zone to ends one if needed.