I do not know. Remember there was a man reported wearing the same 'hooded jacket' sneaking around the neighbor's house, and throwing some bug/rat bombs on the floor.
- was Jack already dead?
My guess is YES.
What and where was he during the time between 'early afternoon' and 8:30pm ????
Yes, I remember the description of the guy walking away from the smoke bombing. I often wondered about the last description of him since his friends and family have said he never wore clothing like that.
Good question on the time void. There are tunnels that go from Nemours to DuPont also. I fear we may never know.