Sport science did an episode on McCarron and Bridgewater that can be found here on youtube. I don't like to take their rankings and grades seriously, after all they had Ponder grading out very high, higher than Bridgewater even, but their drills they run can shed some light on a QB's ability. Bridgewaters passes were coming out with an angular velocity of 2,200 degrees/second. His passes travel at 54 MPH on a throw, which ties Cam Newton, and puts him just below Colin Kaepernick and Ryan Mallet, but above Drew Brees. Overall, he is about halfway between Brett Favre and average.
How does this translate to his potential success? When he throws a 20 yard (from him to the receiver not the LOS to the receiver) pass it will get their .1 seconds faster than the average QB. That may not sound like a huge difference, but with a DB running at full speed it equates to a throwing window 1 yard larger than the average QB would get.
Barrs video can be watched here. The grades on Linebackers are a little more believable with Luke Kuechly, Von Miller, and Demarcus Ware ranking up the top, and Barr grades in Between Miller and Kuechly. His 20 yard split was faster than any RB, TE, or LB that they tested. His center of mass is that same height as Giovani Bernard does on his cuts despite the fact that Barr is 7 inches taller and just a much larger person in general. This allows him to burst out of his cuts with 4 G's of acceleration which is about the same as the world record fuel drag racer, and more than most high G roller coasters. He hits the sensored dummy with more than 2200 pounds of force. Ray Lewis provided 1,000 pounds of force. Horses kick at 2000 pounds of force. Barr is simply a beast.