JD.........this is where you have to dive into furniture history and make your own criterior. First off you are dealing with 2 economic entities, a country in England and the Colonies. Also you have to think of communications of the day and where the wealth started. You need to establish a time frame first, look at William and Mary and see the evolution from Bun feet to the cabriole leg....specific to Queen Anne will be the pad foot. In England you will see the Georgian Period mentioned in amongst your research. It's which monarchs rein of the time.
Realizing communication was slow, the styles defined in England came years later to the Colonies. JD you now have to put yourself in the position of a businessman like Chippendale. The colonies economically are growing and England at the time takes the archetectural knowledge from the Roman Empire and puts them in play on a large scale. England is a weathy nation.
Chippendale feeds the need by taking Queen Anne to the next level. Out with the pad foot in with the ball and claw, out with the solid back splat of Queen Anne in with the the pirced splat. You see the same style, but its finer. Queen Anne is a bit bulkier, Chippendale is more refined. Realize in England the furniture was big in scale because the estates being built were big. If you recall in our visit to the Adams Family House (snap-snap), on the second floor was a big giant piece of furniture near the stairs that came from France, it was way out of scale. It was not meant to sit in a colonial home. In England, Chippendale created demand by changing the styling of furniture, much like the auto industry 100 years later. The guy was ahead of his time. Look to his different styles, late in his career, he even did some pieces based off of Adams, Federal Style. Look at Hardware!
Next you need to investigate, that as the colonies grew economically, they wanted nice things to basically show off, ie: T's Bombe in 1750 was todays Lambougini. With the release of T-Chipp's Directory, the craftsman in the colonies had pictures of his style but they had to be scaled down to fit the size house that was being built. Each region in the Colonies, New England, Mid Atlantic, Southern regions all interpreted differently.
As more wealth was accumulated in the colonies and more jobs could be supported, unbelieveably skilled craftsman came from across the pond and fell right into building out of Chippendales Directory. As a port city, Philly got more than its fair share of highly skilled craftsman who went to work creating smaller scaled Chippendale when compared to that being produced in England.
JD, this should give you a sound base to blast off of. You have to dig-in and read, look at pictures, get a sense of time frame and then create your own period study. This is what makes furniture history so interesting. The social and political cross-over, the time frame of each style being interpretted differently at different times. Its easy to say Philadelphia Style Chippendale, but what was going on outside of Philly in the Delaware Valley at the same time. Maybe it doesn't get interpretted until 250 years later by you.
There's much self interpretation to furniture history based off of what you expose yourself to, that's why you need access to numerous sources.
JD.....Never forget Chippendale was a businessman first, designer 2nd, cabinetmaker 3rd........hope that helps.