yes - now compare both pic - the one of my friend and the ones you posted - in one pic, Person is wearing a body armour and on top of that theres Tactical vest - so obviously fitting is going to be loose,
also weight of the mags and stuff pulling the pouch that is the part of lighter vest to the front, its like pulling your shirt or when you have a heavier phone in front pocket -- its hanging --- that gives its loose fitting
Now look at the other Pics, here pouches are attached directly to the body armour using MOLLE system - you see the netting on Body armour vest?? and also same thing is done to the bags / racksacks
you can look at youtube to get a the complete pic how each pouch is attached --- that makes it part of the Body armour --- and weight of the mags and stuff is counter balanched by the heavier body armour that is fitted well to your body ---
look how each pouch is attached to the body armour, making it part of the vest