Do you have more pictures than that? PM me if you don't want to post them.

Because so far those pictures and your conclusions don't indicate much except that you have never held an actual S5 in your hands.  That isn't sheet metal, that is flimsy soft plastic, most likely polyethylene.  They practically deform in my hands when I hold them, and definitely would deform if grabbed roughly.  If it WAS evidence of temperature damage, LDPE has a deformation temperature of 32C to 41C and HDPE has a deformation temperature of 43C to 49C, so there's no "100C" anywhere near this.  Source: http://www.pvc.org/en/p/heat-distortion-temperature-softening-temperature

That second pictures indicates very little about temperature either.  I've seen PCB capacitors catch fire and burn out like that at a variety of temperatures; most of them weren't heat related.  Jonathan should know this stuff too, he's a smart guy, so I am surprised he sent you those pictures as evidence of heat damage.

I'm not saying there wasn't or was heat damage, I'm saying those pictures show jack shit to someone who actually has done this stuff before.  Jonathan is smart; if Toomim is truly as awesome as you say, they should be held to a higher standard than pictures like these for an "investigation."

** Full disclosure - I used to consult for Asicspace, but haven't had any real impact there in months and discontinued my affiliation with them weeks before this incident or even before the DC was filled.  **