Because she is the current Great Scientist, while the former one has already vanished and the future one is yet to be born—well, that's getting a bit off track. Anyway, the dark-sector scientist did something to find the legacy left behind by that vanished temporal Great Scientist, and through that legacy, they acquired this technology... This is a paradoxical technology, or rather, a technology that defies causality. Simply put, it's a temporal paradox: the dark-sector scientist traveled to a timeline where this puppet technology had already matured to acquire it, and then returned to a timeline where the technology had yet to appear, passing it on to the first master of puppets. The technology itself is something that arose from nothing.
"And... what's most terrifying is that even the Great Scientists cannot make head or tail of puppet technology. They have completely bewildered themselves because puppet technology is progressing on its own. That's right, the technology itself is seemingly like a living entity, constantly progressing and evolving, and the basis for its evolution is those high-grade puppets. As you all know, the Ten Great Sects outwardly claim that our ultimate goal is to manufacture Emperor Grade puppets, right? No, actually the ultimate goal of the Ten Great Sects is to be able to control Emperor Grade puppets, and merely to preserve themselves amidst this puppet irresistible momentum..."
The puppet irresistible momentum...
Chapter 517