Maybe your species' scientists messed up like that, but ours didn't. And even if they had hyperdrives before the rest of the species learned to make fire, there still wouldn't be enough time for the flagship to return to our space after escaping the destruction of the shipyard."It turns out that that one incident where a hyperdrive prototype mysteriously exploded, was actually them stealing the technology and covering their tracks. That have been through hyperlanes a decade before we were."