I don’t know that it’s accurate to say the promos have focused unduly heavily on Eve or Nick/Eve, any more so than they’ve focused on other pairings or on the other individual characters. But I do think Nick and Eve are both central to whatever the big finale ending is going to be. So far they seem more directly tied to whatever’s going on with the keys, the mirrors, and the symbols than anyone else except for maybe Diana.

And in 6×11, they’re supposed to be off on a mission without the rest of the team, so it definitely makes sense that they would be more prominent in the promo material for that episode. Even still, Eve is only in four images of the twenty-four available for that episode.

Mainly I just think it’s cool that they took a female character who started the series mostly in the background as a love interest and–instead of phasing her out with a break-up or killing her off for mangst–they just made her stronger and more prominent and interesting as the show went on, until finally she’s arguably just as powerful and integral and important to whatever weirdness is happening in the show’s mytharc as the male protagonist.