The riders appear more forward because the frames are small. With easier gears while climbing your weight needs to be forward or the bike will come back over on you. The small frame allows you to be back for power while over the bars for climbing stability.
The third pic of the guy on the specialized, that stem has to be 110 or longer. They look a little upright to me. All this on the forum is great info!

---

http://www.mybicyclefit.com