Guys, You have to think critically about any information presented to you... mine, Potterfield's, your mom's... whatever....
How much does it matter how fast the guy who owns midway can pick up a gun from a table and hit a pie plate?
Probably not enough to to justify the time it took me to type the question. I don't know how much more valuable the pieces are if they are "explained" more.... they are what they are, an opinion and a demonstration of his abilities.
That said, his comparisons of HIS performance in a non-defensive, sport shooting situation does provide some objective data and a basis for people to make decisions about which types of firearms they should go out and train with, purchase or consider for self-defense.
Take it for what it's worth.
-RJP