Yes I noticed this as well (and Kosheleva will be in position 6) in the past.. maybe they changed the rotation? And Goncharova hits MUCH better through 1 than 6 due to her goofy approach.
Well it might be because Russia's block is quite strong and tall, so zone 6 is covered by it.. Of course strong attackers can hit high hands and the ball can rebounce there, but the chances of getting blocked are much higher.. And in zone 1 there are tips, roll shots which Goncharova will pick up much harder