Mimicry
The Chaos aspect of his Balance aspect could only be described as destructive. The Chaos aspect of his Cultivation aspect could already disperse qi that touched it, but this aspect could directly twist, bend and destroy it.
If every movement of his Heaven aspect made him fuse with the world, every movement of his Chaos aspect disrupted the world, shattering its laws, distorting its foundations, and ripping everything known to shreds.
Just by existing, Ryu's Heavenly Chaos Bone Structure was entirely contradictory, and yet it was perfectly balanced and didn't show any signs of lashing out against Ryu.
Even so, this wasn't the greatest change that Ryu's Heavenly Chaos Body had allowed. In fact, even if he gave up all of the other changes, so long as he could keep this one, he would have been endlessly satisfied.