According to Mr. Tracy, Ed Parker had him study weapons forms to fill a perceived gap in kenpo. Parker at some point realized that weapons were not actually a part of kenpo, and moved more into designing his own weapons sets. Mr. Tracy had already put in years of research and liked them, so he continued.
He is one of two men in the US given permission by the deceased system head to teach Bok Fu (White Tiger Staff). I believe that Richard Lee (bok fu kenpo) is the other. If my memory is correct, our first two staff sets, Darkroom Staff and Skylight Staff, are Al Tracy creations based on some of the 18 forms of that style. There is a White Tiger Staff form on one of the videos, but not required for the system. He also learned the Wong Family Shaolin Hand Set from a man in Chinatown, San Francisco, who claimed it was the major form of his family's art.