Actually, Jack Clark was also an Innate Awakened One.
It was just that his innate awakening ability was his soul, and he had split half of it off to become a Six-legged Salamander.
And this split wasn't just a simple Avatar, it was as if a 'Person' split in two, becoming two independent yet fundamentally connected special beings.
Compared to the soul split of the original body, the Six-legged Salamander had also innately awakened, acquiring the ability to evolve, and this innate evolution ability was complete.
Moreover, with the half of the original body's innate talent blessing it, this was why the Giant Beast Body's strength was improving at a pace far exceeding that of the human body.
Had it not been for Jack Clark's soul power condensing in his previous life, forming what he perceived as the attribute page, the gap between the human body and the Giant Beast would have been even greater.
To this situation, Jack didn't really mind, because both were him.