It isn't necessarily that he could not weave around a tire in the middle of the road, though I am not convinced that he could. It is more a thought that someone who knows him well would know that, with nightfall coming quickly, he was the kind of guy that would stop to get out and move the tire so someone else wouldn't hit it or have an accident trying to avoid it.
That road is not a major thoroughfare. It is lightly traveled, and especially at that time of evening. Leaving a tire in the middle of the road may leave too much to chance, if only one person is involved, but if there are two, it could be far easier to know when to expect him to show up at the designated spot.
Finally, speculation does not equate to facts, but with few facts, speculation is what we are left with. And speculation CAN become facts, and often does. Those of us who have been on this site for many years can tell you that, despite what you may think, Occam's Razor does not always apply. If it did, most of these cases would be resolved within a very short period of time. While wild speculation is not appreciated, I have seldom ever seen wild speculation on any thread I have followed in the decade plus that I have been here. Speculation is how we arrive at facts. JMO
Very good thoughts. I agree with what you're saying.