I could be wrong, but isn't structure a necessity?
Because without structure, the body would just be a noodle. So we have to have some way to hold the body together (structure) in order to direct force to and from the ground. Am I incorrect in this assumption?
I was always under the impression that 'stucture' in this context mean't holding specific postures or more generally using the bones as the pimary route to sustain forces through/in the body. Consider the octopus ... no bones yet ruthlessly efficient hunter - all soft tissue.