That's because NOBODY was going to hire Muschamp or Kiffin, they were both massive failures. Richt had a lot of success for a long time, He'll have multiple offers to become HC and probably a couple pretty good jobs. You can't compare him to those two.
Yes, it's Les' fault that he didn't recruit receivers who are 15 feet tall and have wingspans bigger than a Cessna.
It matters a good deal who your assistant coach is when you're recruiting a quarterback. No one thinks Les Miles is the man to see about becoming a good quarterback.