"With high impact plyo such as box jumps you should be able to squat at least twice your own body weight before attempting them or else you're inviting trouble. For explosive power, plyometrics are unparalleled."

You know, exercise science really is the bastard child of science. Very little peer review and a lot of studies that are used for proof of certain theories had little scrutiny compared to other fields. (psychology even has more peer review)

There is no conclusive evidence that you can bypass the type I fibers and exercise the type II fibers with any sort of exercise. The type I fibers exhaust and then the type II's are activated, so the thought of building "explosiveness" in with any sort of exercise is a belief that's being taken less and less seriously. For every division I school that does a lot of plyos and olympic lifts, there are schools that use none and just high intensity weight training programs. You wouldn't notice any difference in the perfomance of the teams. (You might notice a difference in how many of them are injured at any given time, though)

Also, keep in mind that when you become more adept at plyometric exercises, you're only becoming more explosive in those movements, not the ones in your sport. The brain is specific in it's neural pathways and it's not going to use the same one for different movements. Freakishly explosive people like Bonjasky were more likely born that way, or they simply practiced their sport a lot. I've met plenty of people with freakish verticles or crazy speed that never did any plyos, and i've met a lot of people who did plyos all the time (correctly, with professional supervision) that had two left feet.