I, too, feel that DR is the most likely to have abducted Jacob. With this Feeney thrown in (if it WAS him at the Tom Thumb that night at that time), I can also like that he had a visitor that night and the both of them had a hand in this. I have swayed and looked at and bought in to many other possible POI's, but, like I said, I do keep swinging back around to DR.
I don't know about the whole special ops hiding in the bush scene, and I don't think he was hiding in the grass lying in wait when they were on their way TO Tom Thumb. He had reportedly been out running, and it was dark at that time. Quite dark, actually, thus the boys brought flashlights. He could have been running along the road towards his home and heard/saw the boys coming down the road, then went into the ditch at that time, at which point he deduced they would be coming back that way, more than likely had enough time to go down the drive, grab some of his mother's nylon stockings (which we know for a fact that she hung over the shower rod), something resembling (I don't think he actually had a real gun) a gun and went back to wait for their return. He stops the boys, asks their age, etc
Alternatively, if we factor in Feeney, let's try this scenario: Feeney was visiting DR. Feeney was readying to leave DR's and when walking to his vehicle he heard the boys and he followed in the ditch. Awaited their return and stopped them, taking Jake (here is where the car facing towards the house in the driveway theory comes in) grabs him, pushing him into the car, moves it up to the house, and brings Jake inside to DR. Feeney then leaves to go to the Tom Thumb to watch all the chaos unfold. A stretch. But I could buy that.