I don't understand why arm length is deemed more accurate than the traditional "reach" measurement or wingspan. Example - If Paul Williams has a reach of 82" then his chin is about 41" away from his jab when he throws it. I don't care how long or short his arms are, if his chin is THAT far away. A guy might have six inch t-rex arms, but if his shoulders are broad enough to build an outhouse on then your no closer to him to hit. Arm length means a lot less compared to reach in my opinion, even if these numbers are accurate...