More appreciated after watching twice

Rating: 8/10 (1 August 2013)

I never watch a movie once. There are so many things I catch or understand better after watching the second time or even third. I have a couple issues or questions. Was the Oddessy just orbiting earth for 60 years and the scavs just happen to get the one with Jacks wife in it? It also took them 3 years to find Jacks cabin in the woods? I thought the scavs were "watching" Jack all the time and you would have thought they would know where he takes hours and hours break to relax and chill out.
Why doesn't the aliens just kill the scavs and nuke them or something. Then they wouldn't need drones, Jacks, or Victorias either. All that work involved to just keep the tet running that's basically pumping out human clones?