BBM
I think about that a lot and I wish we had more information about this. The early reports, if I remember correctly, were not specific as to whose scent this was but MR said Dylan on the call. Also it doesn't say which direction the scent went from the house or where this 50ft measurement begins - from the door vs the end go the driveway.
If you zoom in on the Google maps or look at some of the pictures of the house, there isn't any yard/walkway from the house to where MRs truck is parked. And the driveway itself is only a bit longer than the truck.
I don't see a scent trail 50ft long leading to MRs truck. IMO, this is the one thing that seems to point to Dylan being out of the house and getting into a vehicle. It could be an vehicle, but IMO, it is not a vehicle in the driveway but one that was out on the road.
But, as I said above, we're missing some critical information about that scent trail.