Continuing the discussion about opinions, facts and “facts”, I think that it’s the nature of the instrument that creates all that controversy.
Troy explains what worked for him when there was zero info online or on tape. He obviously tried his methods with other people and he has seen some results.
Pro players like Graham, Stump, Teemu, and others have reached their level of skill with different methods, so when they get asked about it they give different answers. That doesn’t mean that Troy is wrong and these guys right, or the other way around.
There are many many ways of practicing, holding a pick, hand anchoring, etc. Troy has shown on his material here that many things can work in the right context. There are players like Marty Friedman playing so advanced stuff with so awkward motions, angles, etc, that means that it’s possible.
There is not a universal truth about practicing, about holding a pick, or about anchoring your hand. That’s why guitar is so unique, everyone has an almost different way of doing things. The hard part is to find your way of doing it. For example I haven’t found it yet, many angles or motions feel awkward to me, but I’ll figure it out eventually.