Почему тхеравада - не индуизм?

КИ
есть маленькая, маленькая такая деталь. Кроме упанишад есть брахманы и араньяки))) Они сильно пораньше были и в них не только ритуалы очищения и мануалы по жертвоприношениям.

...
Санскрит это понятно, смесь санскрита и пракритов же. Но при чём здесь именно Панини? Санскрит и до Панини был, и он не первый грамматист, в его трудах следы предшествующей грамматики есть.

Санскрит не мертвый язык, а искусственный.

pre-Buddhist,
~9th to 6th century BCE[1][2][3]
The Brihadaranyaka Upanishad is estimated to have been composed about 7th-6th century BCE, excluding some parts estimated to have been composed after the Chandogya Upanishad.[6]
Scholars have offered different estimates ranging from 900 BCE to 600 BCE, all preceding Buddhism. Brihadaranyaka is one of the first Upanishads, along with that of Jaiminiya Upanishad and Chandogya Upanishads.[12][13] The Brihadaranyaka Upanishad was in all likelihood composed in the earlier part of 1st millennium BCE, in the 7th-6th century BCE, give or take a century or so, according to Patrick Olivelle.[11] It is likely that the text was a living document and some verses were edited over a period of time before the 6th century BCE.[12]

8th to 6th century BCE
The precise chronology of Chandogya Upanishad is uncertain, and it is variously dated to have been composed by the 8th to 6th century BCE in India.[2][4][5]
Scholars have offered different estimates ranging from 800 BCE to 600 BCE, all preceding Buddhism. According to a 1998 review by Patrick Olivelle. Chandogya was composed by 7th or 6th century BCE, give or take a century or so.[4] Phillips states that Chandogya was completed after Brihadaranyaka, both probably in early part of the 8th century BCE.[2]

"Искусственный" ведь не означает, что сделан с нуля инопланетянами. Обработан и строго грамматически оформлен, в отличие от разных говоров.