"You have indeed learned much. But you still have not described the purpose of your boundary-drawing. Do you wish for Ah-Chen's resurrection for yourself, so that you may feel less lonely and grieved, or do you wish it for Ah-Chen's sake, so that she may see the world anew? For these two purposes will give us very different boundaries for what is an acceptable Ah-Chen."

Poor Shen Chun-lieh should have just said he wanted the {CEV} of Ah-Chen + Shen-Chun-lieh.

I don't think anything less than CEV or equivalent will actually pinpoint individual identity sufficiently well that we will have no complaints about resurrecting people from the best information available. If I had to manually pinpoint my own identity I would accidentally carve off entire swaths that I don't even know I have and distort the other parts. The physical description of my body at the planck scale is too limited; I would never change. Au-Chen brought back from the dead perfectly would be a little girl dying of smallpox; curing the smallpox would destroy her planck-scale identity. I don't know what level of accuracy is sufficient. I can only assume that it's somewhere between planck scale (or even atomic scale) accuracy and the mess that is ~80 years of gene-driven growth and change of a human body.