Mao and Yuna have never skated clean without mistakes in the same competition, so if you want, you could also say Yuna "only" won something over Mao if Mao had a mistake. And Caro's jumps in this WC were UR? Do show me where it says so on the protocol. This was a very strict technical panel and I don't see a single call for Kostner. Kim is hardly the only one with great technique on jumps, and she in fact has received numerous edge calls for her flip. Kostner, on the other hand, has received no edge calls for either her flip or her Lutz, ever.
FYI, Yuna received one edge call this quad (...controversially so, since afterwards, multiple commentators looked at it and didn't think it was deserved), and one "e" call during the 2008-2009 season and multiple "!" calls during that same season. Edge calls in one season that quad and in one segment of one competition this quad don't disqualify her flip technique from being considered great. Yuna had one of the best 3F/3T combinations of all time. Kostner's is just as good in terms of height/distance/flow, but Yuna could do a transition prior to her 3F/3T, which I don't recall Kostner ever doing.
Btw, has Mao ever skated perfectly in both the SP and FS in the same competition as a senior? Can you recall? I'm sure she did at Nationals, but can't recall if she did at any international competitions. It's ok if she got the lutz call, but no URs, DGs, step-outs/two-foots/pops.
I do think it's funny that neither were clean in the SP+FS at the same competition, but that's probably due to them each rarely skating cleanly in both the SP+FS in a major competition, period.