Everyone mentioning charities driving the vote makes a good point. Additonal to that, Scott & Amanda supported the same charity - many other teams split the charity vote in half, if you think about it. There were 5 charities represented in the final three teams. The charity that won had the full team representing it. Might be a factor.
Also, aside from the twist and throw, Marie France had plenty of showy moves and lifts, at least as many as Violetta and Jason. This isn't like Shae & Patrice vs. a pair team. It felt like two adagio pairs and a real pair team.