The limit of power in the world of Aries is 99 C. This means that their power output when fighting anyone or doing anything must be limited to 99,000,000 F, 990,000 E, 9,900 D, or 99 C.
In comparison, the power of a peak stage golden core cultivator with 110 level of mind, 110 level in internal energy quality, and a perfect core of 1,024 core power, will have a power output of 12,390,400 F or 12.39 C.
So they still have a leeway in how much power they can display. With 99C worth of power, they can defeat any kind of golden core being. But 99C power output is more than 20 times weaker than the power that they can produce with their true body at the peak of the fifth mortal coil.
