Donning my flamesuit here somewhat as I realise I am but an amateur in a field of people with way more experience than myself, however here is my 2 cents worth..
Firstly, speaking as a student aircraft designer/engineer, having just completed a major project on stiffened skin structures, I'm amazed that damage is economic to repair on any aircraft let alone a 9 year old one. To get skin creases like that will involve buckling on quite a few stringers, and possibly damage to the radial hoop frames as well - the skin and hoops are a local item but the stringers run a fair way down the aircraft so that must be a hell of a job to drill out all the fixings and replace them (having had to strip out a correspondingly large part of the interior to get to them).
Secondly, as regards the 787 in a similar situation... composites are somewhat of an unknown quantity when damaged because its impossible to tell the extent of delamination inside. Having seen the results of a CF monocoque wing bend tested to destruction, I would say that the greater strength and flexibility of carbon would have either absorbed the impact without plastic deformation, or if the force was great enough then it would have delaminated and cracked open and be a total writeoff