Hmm. Hadn't considered that. I suppose it well could be. I'd still think that there'd be more significant fracturing of the concrete layer above the reinforcing bars.

But that's the kind of stuff I'm talking about. Personally, it offends me more to hear "don't talk about it because you'll offend the dead" than "hey, I don't see how it could have happened that way" followed by a "well, here's a possible explanation".