The analogy i see is Arabs->later advancements(7th century and later) is the same as Mongols->later advancements(13th century and later). Both Arabs and Mongols were not inherently as "advanced" a civilization as the ones they conquered.
Unlike Mongols, Arab and Muslim scientists are well-knwon to have numerous and extensive contributions to the scientific knowledge. A lot of the novel scientific, mathematics, and other knowledge terminology are based on the Arabic languages namely algorithm, chemistry, alkali, just to name a few [1].
For medicine alone the contributions are numerous from Al-Nafis discovery of blood cirtculation several hunderds years before Harvey[2], Avicennna's book adoption as standard medicine textbooks for several hundred years at Oxford, Cambridge and other major European university [3], Ibn Al Quff the father of modern anesthasia [4] and Abu al-Qasim al-Zahrawai the father of modern surgery [5].
Actually I want to mention well-known contributions to mathematics and astronomy by Arab and muslim scientists and mathematicians as well, but I think you probably get the points by now.
If your claim is true about the Mongols I'd like you to come up with similar list just for modern medicine alone from the Mongolian scientists (not ancient China) but I doubt you can and will.
If anything, pointing to various scholars with Arabic names in a large geographical area which hosted "advanced civilizations" before their conquest by Islam only strengthens my argument.
It is the achievements of the native people which were built upon by the now larger group of people of various ethnicities which is being pointed out. Islam was a conduit for the spread of ideas and not their originator. The Arabs were as "primitive" as the Mongols after them. Only after "mixing" with other ethnicities, converting them to Islam, making Arabic official lingua franca were these countries "Arabicized".
The difference between Arabs and Mongols is that the Arabs gave themselves a specific identity i.e. Islam which they then imposed on others while the Mongols integrated themselves into the native cultures.
The analogy i see is Arabs->later advancements(7th century and later) is the same as Mongols->later advancements(13th century and later). Both Arabs and Mongols were not inherently as "advanced" a civilization as the ones they conquered.