Light
If others knew what Ryu was worried about, they would surely be infuriated to an extreme. But Ryu was only doing this for his wife, and he didn't give a damn about anything else. In fact, the only reason he was on this world in the first place was because of another one of his wives. If not for this leverage, the Dream Wraith wouldn't have been able to force him to do anything. After all, technically speaking, it was the Dream Wraith that owed Ryu, and not the other way around. Ryu had even managed to decipher the Inheritance of the Dream Wraith on his own without accepting it.
Regardless, he was still dead set on keeping his promise and finishing within 10 days.
Technically, he had already accomplished what Ailsa wanted in just three, but he didn't want a technical victory. He wanted a true victory.
He was perfectly fine with his wives being willful… but there was something quite profound hidden within that.