Heat can cause strange random failures...Some years back I went on summer vacation and left the AC off. I came home to find my table model Silvertone color roundy sitting at a funny angle and fragments of a black material on the carpet. What happened was that the heat caused one of the plastic feet to shatter out from under the set.
Lesson learned I try to never leave my sets in un-airconditioned storage conditions.
Was that picture in the first post from after the implosion? If so it seems off to me. Despite the odd speckling (which I'd presume is glass shards from the implosion) the safety glass seems intact, and the CRT face behind it also looks undamaged (which would not explain how the speckling occurred). Also if a hole was not made in the safety glass or the outer layer not knocked loose how did the glass get from inside the cabinet to on the floor in front of the set?