As someone with two degrees in linguistics, all I can say these charts and divisions are always fucked up, no matter what you do.
Language divisions are always, at best, fairly subjective. Usually the dividing line is mutual intelligibility. But imagine dialect A in Valley A, and the speakers have mutal intelligibility with the folks over in Valley B, who speak dialect B. Those dialect B speakers get along with the folks over in Valley C, who speak dialect C, which is also mutually intelligible with dialect B. But get this - dialect A ain’t mutually intelligible with dialect C. What language do they speak? One language? Two? Now, for extra credit, throw some politics in there, and you can better understand the Chinese umbrella and the Hindi/Urdu division. Nope, that diagram don’t make no sense, but it’s far more complicated than that diagram can explain, too.
