Can the casebook "add" a rule that is not in the book? Interesting. The casebook can certainly clarify or give examples of the application of rules in the rule book, but can it add a rule that isnt explicitly in the rule book? An interesting question. Maybe that is getting a little to "lawyerly" in my source of rule analysis. But interesting none the less. I'm still going to have to think about this one.
Thanks for bringing this up, Nevada. Maybe I am sick in the head (well, ok, I definately am) but I like examining the rules this closely.