I got to give you props for coming up with a well written explanation as to the origins of Quintessa and what a hypothetical Transformers 6 would have been. If I were making a Transformers 6, I would have it so that the Quintessons were the "mediators" between Primus and Unicron. Primus, representing order, has sway over Cybertron and other mechanical worlds. Unicron, representing chaos and the comparatively chaotic nature of the geology of worlds like Earth, would have sway over Earth and other terrestrial or gaseous planets, often with organic life. Tens of millions of years ago, Unicron was having a stronger sway over the universe, and the balance was tipped toward chaos. To right the ship so to speak, the Quintessons used the Seeds to cyberform thousands of terrestrial planets with organic life. Furthermore, from the resulting Transformium they made lifeless, robotic slaves that would obey their every order: the Transformers. These Transformers would be the enforcers of balance the Quintessons had long desired. One of the leaders of the Quintessons, Quintessa, sought immortality and power, and so she uploaded her mind into a new, Transformium-based body with heightened abilities that would not age or decay. However, there were some within the Quintesson ranks who, disliking how the Quintessons were treating other beings in the universe, sought to sabotage their efforts at balancing and managing the universe. They acquired the Allspark, and object with the power to give life to machines, and gave life to the Dynasty of Primes, the first Transformers with life. These Primes, realizing they had been slaves, rebel against the Quintessons and are able to send them fleeing. After the Quintessons have left, they use the Allspark to give life to the other Cybertronians and begin a new civilization on Cybertron. While most Transformers remain unaware of their origins beyond the Allspark, some become aware of their true origins due to the continued interference in Cybertronian affairs by Quintessa. Obviously wars and destruction and Transformers leaving the planet follow. Now in the present day, with Cybertron heavily damaged and Unicron awakening, the balance tips toward chaos once more.