To deal with Sword Douluo and Bone Douluo, there was no need whatsoever for Ye Xuan to use the power of his Double Pupil and Supreme Bone.
Using the Double Pupil or the Supreme Bone against Sword Douluo and the others would be like using a cannon to shoot a mosquito.
He could do it, of course, but there was no need, and it would be a waste.
Chapter 27