Here's an interesting thing, while I'm here... and talking of lividity.
One of the traits of lividity is "blanching", which is where an area is left bloodless due to elevation or pressure placed on it (shifting the blood out of the area). So a guy who passes away on his back will have blanching where, perhaps, his shoulders and buttocks touch the ground, and the pressure of his own weight forces the pooling blood to leave those areas.
Now, one of the things that can cause blanching is tight clothing. And as I was staring at crime scene photos the other day, I could *swear* one of the bodies had blanching on the rear end, in a pattern that strongly resembled a pair of jockey shorts that he'd maybe outgrown a little bit. Ie, the blanching wasn't just on his buttocks, but at the sides as well, following the general shape of a pair of undies. Which said to me -- if this is at all possible and I am not just seeing inkblots (I hate when I do that....) then there's a chance one or more of the boys was clothed when they died. And stayed clothed, for 30 mins - 6hrs afterwards.
Okay, not a major revelation, but small discoveries add up, eh. But yeah, will be doing more staring in a few days, and am quite happy to be wrong if I am.