The reason that I list Yuna Kim alone as a two-fer among active skaters is this. Her CoP programs are 6.0 programs. IMHO her performance of Les Miz at 2013 worlds, just as it was, would have beat any ladies’ LP ever, CoP or 6.0, including herself at 2010 Olympics.
I have to make the case for Michelle's 7-triple Red Violin program at 2000 Worlds. And not only on tech. Her second mark in this program (and in many other programs) would beat Yu Na here.
ETA: I don't think her Les Mis program at Worlds is better than her 2010 Oly LP, either. In many ways, they are the same program, in terms of content (with a few adjustments for the changes in scoring). But her 2010 program had better music and, in my opinion, better artistry.
I think Yu Na's best program, and best performance, was her LP at 2011 Worlds. Unfortunately, she made mistakes on several of her jumps that kept it from being among her best technically. But her footwork, the placement of the spiral and the overall choreography were all superb. Skated without mistakes, it would have had a few 6.0s for presentation under the old system, I think.