Does this prove David Vizard's 128 lsa formula ?

I'm sure it's a valid formula, in application, and certainly better than just guessing. I'd use it in a heartbeat to select a cam. I certainly don't have anything better to use and I wont purchase several cams in the pursuit of perfection. I think for most guys we just need it to be as close to "right" as possible, out of the gate. We're not gonna be swapping around a bunch of cams to test. So in that way, it probably works well.

All that said. I think it's far more a correlation, than a real explanation of some underlying principles at work.