The pinpoint serve doesn't really provide more leg drive, but it facilitates a greater "bowing" (as in bow and arrow) of the body. Taller players will toss farther into the court, and get an even greater "sling shot" effect with the pinpoint.
By bowing you mean? It's a controversial issue to say the least. Why don't you paste a URL from the Stroke Archive in this thread that shows what you mean by bowing?
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