As far as 10000 fitness: last year Farah beat Kam by 4 seconds. Their half marathon PRs going into Cardiff were 38 seconds apart in Kam's favor. Kam beat Farah by 49 seconds, with a fall that cost him around 15-20seconds.
Factor in Kam being much younger, and it is looking like Kam will be in better straight time fitness for 10000 by 10-20 seconds. whether this is enough to win by leading most of the race in Rio is a close call. WIth help from Karoki and/or Tanui it seems quite doable.