inflight photo: smoke or fuel?
FUEL.
#2 tank has been perforated, at least in 2 places. Engine exhaust is affected by the vortex sheet rollup and eventually is entrained into the tip vortex over some distance. (flaps alter this somewhat, but the inflight photo shows the trace from inboard of #2. The photos of the wing upper surface inboard of #2 show penetration behind the spar as well as in front of the spar). Question is whether the spar itself was penetrated which would be expensive to really expensive.
As far as making a dry area aligned with the area inline with the turbine disc, in the wing a swept span makes that volumetrically prohibitive. No practical amount of armoring is going to stop a penetration from a disc section release.
FDR