"....sparks from tires...." Words not said, and a studied response meant to mislead/demean. Sparks from H member? possibly, as well as shed bits of tyre independent, precedent, and unconnected to Titanium Strip? Of course it's possible. To be fully committed to tyre burst via Ti, at the complete exclusion of defects known to have started at Brakes release? A leap, a leap. The a/c was known to have been tracking indifferently. Yet all focus is on the Ti, conveniently lying in wait in a place that would have been benign, had she been tracking true. A theory, and worthy of attention equal to the "Slasher" theory. The Fire was a follow on, regardless of Fuel dump causation. The Titanium had not started the Fire, technically, it could have had nothing to do with it, absent a slewing airframe? All causes are contributory, except the ones that are not.