That doesn't make any sense though. Look, think of the First Ones as "the thing behind the curtain we aren't supposed to know about." The Zereths are all basically 3D printers for the universe we're never supposed to go to.
The First Ones themselves aren't even really a factor. They're just a big mystery meant to give the setting scope. Attaching Order specifically to them fucks the entire concept up, because it's supposed to be what the Titans are.