Visual outcome does not tell all the story.
Saga is 4 star rated NOT 5.
Additionally every car front will show normally a more damage because of the softer zone, crumple zones and that includes the bonnet. When the rear ended accident happens the vehicle rear ending , normally push down and go under the vehicle being rear ended and reason being the rear vehicle applying brakes.
In case of the rear end of the vehicle, the vehicles has no air bags and the because of the trunk [ vacant space] , fuel tank , the vehicle is more rigid at certain places comapring front to provide maximum protection.
Daihatsu Boon / Toyota Passo has a 4 star crash rating for the same model as pictured as well.
Lastly, a NCAP testing from one region cant be applied on another. In other words NCAP rating for Saga or for that matter even Civic or Corolla cant be applied on domestic assembly line products. I hope we get a local crash testing agency as well who can evaluate locally produced models.