Regarding Liya's issue not selling well: there is a bias if you only look yearly figures and how that issue compares to other months, because May - July are slow. I believe to form an accurate comparison, you'd have to stack the number against the same month from last year. It will be interesting to see how this May issue compares to Liya's in terms of sales.
Again, I think people who are surprised by the exclusion of Freja, Anja, etc. are exposed to so many fashion magazines that they lose track of where they saw these girls. Freja and Anja, while highly visible, have never 'owned' an editorial in US Vogue so I wouldn't expect them to receive a sudden breakthrough. US Vogue seems to believe that it is the only publication that counts, so it's no surprise that it doesn't acknowledge girls booked by competing titles. What's puzzling is not why certain girls are not on the cover but why they were never in US Vogue in the first place. Is Freja the first Chanel girl in recent history to not get Wintour's seal of approval? I look at her and can't think of what disqualifies her. If Lagerfeld fell head over heels for Irina, I can understand why Anna Wintour would refuse to follow his footsteps, but there is nothing 'alternative' about Freja.
Good lord, I did not realize Julia Stegner is not there. Everyone laments the fast turn-over rate of girls nowadays, but I feel that in terms of trends, we always have a steady stream of doll faces or quirky girls, but not enough classic beauties or Amazonians.
About the cover design, group shoots are never US Vogue's strength. Even when they're done by Annie Leibovitz, the end result doesn't hold up to her work for Vanity Fair. The shoulder-and-above shots are the worst because more often than not they resemble some weirdly disproportionate collarge. The Sept 04 cover is an example of that, and going back further I can cite the dreaded Spice Girls cover as evidence too. UK Vogue, on the other hand, makes a rocking group cover.
And thank you kimair for offering an explanation for me!