The Power Of World Gods.

Only a desperate Supreme Origin god would opt for using fake alternatives to build their world. The ones that do will quickly changed the core of their world to fragments of a realm heart because the difference between 10 and 2 is too much.

Not only is there a large quantitative difference between the core of both types of worlds, but the quality of the world that a Life Crystal and the Authority of the Celestial Supwcan create can't compare to the quality that the fragments of a realm heart can produce. 

The quality of the world that the fake alternatives can create might only be able to reach 2. So the range of power of world gods is 64 with fake substitutes and a world with a quality of 2, to 800 with a core of realm heart fragments and a world with a quality of 5.