Travis,
Welcome to the fun!
You asked, "How about Dellwood being a Tillinghast design?"
It is an original Tilly design.
"Many of your lacked to cite a championship architect as building the other estate courses built around the world. How was the merit of the design? Was it a true masterpiece like his other courses?"
I would compare Dellwood to the Philadelphia Cricket Club and Dallas' Brook Hollow. Like them it was 6300+ yards and built to challenge the best players while being a fun course for Zukor's guests. Zukor wanted a championship layout.
"Or was it done quickly and was not given Tillinghast's usual attention due to the type of project?"
Tilly wasn't one to mail in a project. If he was hired he always tried to create something unique and that would best fit the site. If he wasn't going to be on site he would often times make complete hole models from which the contractors could build from more accurately than simply by looking at his plans. No, we haven't found any models of Zukor's Mountain View Farms but we have photographs of Tilly there while it was being constructed.
"Is The Tillinghast family history, and their influence on early American History, noted when A.W is talked about? Or is this just assumed information by architect followers?"
It isn't assumed information. You can read a good deal of information about Tilly's forebears in the biography, Tillinghast: Creator of Golf Courses. It traces his lenage from when Pardon Tillinghast left England after serving in Cornwallis' army his sons and more who would take the lead in Rhode Island polotics, those who would take part in leadership during the Revolutionary War, serve on the Rhode Island Supreme Court and down through his Father, Benjamin Collins Tillinghast who left the Naval Academy 6 months short of graduating due to an illness (most likely tuberculosis) and then started the Tillinghast Rubber Goods Co. which lasted until the early 1950s when his daughter closed its doors forever some 10 years or so after Tilly died. There is also information about Tilly's daughters and sons-in-law as well as his grand-children.
If you have specific questions about his family ask away. For example, somethings that aren't in the biography are the side of his family that was also involved in the rubber business to the extent of the inventions of various types of rubber tube tires. The Tillinghast Family Association, more than 4,500 strong, meet every two years or so and are quite well organized.