Ok, so in Halo 4, the Librarian clearly states that Forunners and Humans are 2 different species. She goes on to say that humanity started a war with the Forerunners as a result of the Flood introducing itself. But heres my question: How is it that only Humans can operate Forerunner tech and not other races, even though we went to war with Forerunners? The Librarian scattered the different races across the galaxy, meaning she saved all the current species lives. But if Elites existed in the past along with Humans and Forerunners, why can't Elites operate Forerunner tech as well? Did I miss something?
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The Librarian implanted a geas in humanity (a series of genetic commands that get passed down over generations and compel the subject to fulfil a specific purpose), this allows humanity to use Forerunner technology. It is also implied in the Forerunner novels that humans and Forerunners were once the same race, their genetics being remarkably similar, both having been made by the Precursors, but were split into different races eventually.