I think if there had been COP scoring at these Games there would have been a big backlash, because as far as I can tell, Sarah did slightly under-rotate several triples and that would have put her behind Irina for sure and probably also Michelle, despite the fact that hers was clearly the audience's favorite performance of the night. Basically the same situation as Yukari Nakano at 2008 Worlds. I think Irina would have taken first in both segments, Michelle would have been second in both (high program component scores, justifiably so, of course!), and Sarah would have been fourth in the short, third in the long and overall.
PS Slightly off topic, but I think under COP B and S would have won the pairs, taking first in the short by a big margin, coming in second in the long behind S and P but maintaining first overall!