He didn't say Genghis Khan and the Mongols did everything the Ancient Romans did. He said both had their rise to power rooted in a (for-the-time) unique merito

He didn't say Genghis Khan and the Mongols did everything the Ancient Romans did. He said both had their rise to power rooted in a (for-the-time) unique meritocratic element, where people would join you compared to the alternative options due to the ability to advance.