Jealousy And Hoarding.

The mark of sin can also lead to the creation of a demon god which is an equivalent of a Supreme Origin god and even create world enders which are the equivalent of world gods. When you consider that each abyss can create one even if it is destroyed, the full power of the true law of Chaos comes into view. 

That's just an estimation of the power of true Chaos. It pales in comparison to Draco's personal experience of the power of true Chaos. Only those who have gone beneath the abyss to find the source of sin energy will experience the power of the blood of true Chaos. He has done that, so he can only calm down whenever he gets angry and jealous of the shard of power in Legion's possession.