A well fit dolls head provides the draw necessary to prevent the forward thrust on firing that exerts so much force on the hinge pin. It is located at the point where it can offer maximum support. Other guns utilize a draw located at the front of the rear lump and engages the bridge in the action. So, in theory the dolls head provides the necessary restraining mechanism to keep the gun from self destructing itself. The problem as I see it is few were fit well enough to actually do what they were designed for. One notable exception would be the dolls head found on Westley Richards which offers maximum strength. I think some of the American guns, such as Lefever, also work quite well. So, yes the principle of a well fit dolls head is sound from an engineering standpoint.
