Precisely. If the US doesn't have juristiction they will just seek extradition and generally get it unless they fuck up the case horribly (like the Kim Dotcom situation).
Depends on the country. Some countries do not extradite their citizens and some others only if what they are accused of is also illegal in their own jurisdiction...
Everything. They couldn't for the life of them work out how to follow procedure so they got crucified by the NZ courts.
If they had just done shit by the book they would have had him on US soil with no problems at all.
FWIW I don't agree that he -should- be able to be extradited. Just stating the fact that if the US had just not screwed the pooch they would have been successful in doing so.