I'll just say this, Behati isn't quite the skinniest model they have. And when I was ten, I definitely wasn't 5'10. (I am taller than that now, but I was quite the late bloomer)
Also, I personally like Lindsay, a lot. I hate Adriana with a burning passion. I also like Doutzen and do not find a single thing attractive about Erin. Wanna know why? Because, as a man, even, though I will admit to liking breasticles and how they are displayed, I am also able to look up and to look beyond that. Lindsay has a great personality and a nice smile, Adriana, well, not so much. Doutzen's face is amazing.
I find it extremely reductive that one would assume that I (and most if not all men) only look at a woman's body and, TBH, I'd think women would find that degrading.
The point is Angels are spokesmodels and personality does factor in that equation. And VS went from selling bras to women to selling push-up to teens, so maybe that's why they changed their models accordingly.