Question about aspis/hoplon shield

[Giannis K. Hoplite]

It may have had a different funtion, but i know of at least two representations (a vase painting and a terracota plaque) that show the aspis being hung on the back by that rope. My suggestion on why it had to be attached to so many points is that this would spready the weight of the shield to more than two points. The shield was very thin (0,6 cm at some parts) so this need of spreading the weight makes sense to me.
Also, its going around the rim prevents it from getting on your way when using the shield.
So it is not a theory that they hung it from that rope, but some people suggest it should have had an additional purpose...
Khaire
Giannis