An interesting theory...
@ simple-simon post #666
but could you condense it down to a simple version?
Looking at the pattern of the charred area it appears that the longitudinal struts (also a composite structure?) shielded the skin or acted as a heat-sink to pull heat out of the surface.
i wonder if the coeff of thermal expansion (CTE) of the composite is much greater than aluminum and may allow more aircraft growth and contraction such that wire chaffing might occur?