One thing most of the fast boys have in common is completely locking thier wrist and finger joints from moving, especially during shread times. This generates all movement from the elbow, allowing only one joint to isolate the strings being picked. It's impossible to completely lock your elbow from moving, so if you use your wrist while playing fast, it incorporates using two joints and less control at the strings. Your elbow is much further away from the pick than your wrist, creating less movement and energy at faster playing speeds. Some Guys can play pretty fast moving both joints while picking, I prefer using wrist action get some feeling to my playing. Some players are so talented with speed that it becomes a blur and I lose interest. Lynch has a unique original style of playing, but has a simular approach to most of his music. Jake E Lee is awesome with timing and tasteful vocabulary of using patterns. One of the best ever was Randy Rhodes, a genius. One of a kind. All guitarists worldwide lost out on what he would have created next. RIP.