Well I would have to say that any decent bow wood could stand to be cut in half down the limb center and still shoot. Iin fact what you consider awesome is the primary weakness of Osage, the tendency to have little integrity between fibers.
With other woods that would have never happened in the first place. The fact that the bow didn't break is actually not that remarkable. It just has double the amount of limb edges which are not any weaker than the outside edges.