SODA SCIENCE: The Harcourt Theory of Flavor

Here's the latest dispatch from Kris Harcourt, Aussie entrepreneur extraordinaire, who posits a scientific connection among three of the most popular sodas out there:

Only 3 sodas in the marketplace (that I can think of) are unique and original flavors...Coke, Mountain Dew, and Dr. Pepper. Everything else is a plagiarism of pre-existing flavors from nature, usually fruit-derived. Coke and Mountain Dew introduced something completely original that are derivatives of nothing that came before them. As for Dr. Pepper, given that it was created by a pharmacist means it definitely makes the list of "invented in a lab."

I have previously suggested that root beer was another sui generis taste, but my homonymic homie Harcourt argues that root beer is based on the sarsaparilla root, which comes from nature, not from a lab. What do you think? (And no, that's not a picture of Kris. It's a baby yak.)