Ah, but you're thinking too small. If Spain's representative is H/K, then that means Spain's judge will tend to be more supportive of Zhulin skaters, which is better for Bobrova and Soloviev, since Spain knows that the Russian judge will treat them favorably. If Spain's representative is Smart and Diaz, that means Spain's judge will have to be more supportive of the Montreal teams, possibly benefiting Hubbell and Donohue, who also happen to be dating Smart and Diaz.
I'm not saying I believe all of these complex machinations to be true, but because of the way different teams and countries are interconnected, you can see how this is more than just about the teams themselves, it's about how many teams are associated with each coaching team, and getting mutual support from another country for your team. Which in ice dance, when the GOEs can be a bit subjective, can make a difference.
