LOL! I think maybe they just only care about Kurt. Like "Oh shit, we premised this show around this idea of Rachel and FInn being the stars, why did we do that? Argh, we have to make up a plot for Quinn AGAIN?! Laaaaame." And then they got to do a plot about Kurt and they're like "OMG YAY Let's give him relationship stuff and family stuff and bullying stuff and lots of pretty songs and $2000 outfits and fun fun fun!"