I was talking to a construction worker about this car just a week ago (I believe he is a concreter by trade). I was telling him all about the case from beginning to end, as he'd never heard of it before. As soon as I mentioned that there was a construction site there, he said "Well then that's where he is", with absolute conviction. And he had a few stories of his own about how quickly, easily, and silently things can go wrong. I'm not quite as convinced, but the construction site theory is always high on my list. I still give just as much credence to the theory that Brian is still alive though. So there you go, the two theories heading my list are probably the two that cop the most flack.