@Horton I don't think that's a totally different way of thinking about it, they both understand what the letters are doing. As an examole Nate using A makes sense because there isn't a skier who generates more angle, as early as he does, he's spiked ZO early so A isnt going to react like it might for Jason who has a tendency to wheelie the finish of his turns at harder passes (and thus not generate as much angle, as quick as Nate). Jmac is also a bigger, stronger guy and pulls harder than Nate.
I was intrigued by his description because I use B2 almost exclusively but eqrliet this year when I get a strong boat and the line gets shorter I started going to C1 based on advice. I typicallt don't have to make that adjustment on a 5.7 200 but I notice it helps immensely on a 5.3 or even a 6.0 200.