The Canadians had a movement and elegance and a togetherness that comes from competing with each other ever since Moir was 8 years old and Virtue was 6.
They did have a romance as teens, but it didn't last...it was much better for their skating that they not be that involved. However, I read one comment that said there is a special closeness even after the romance is over - and that creates the 'extra' that these two displayed.