The reason that I cannot buy that is that Natalee was last seen on May 30th, the FBI was requested and was on the ground in Aruba June 2nd if not before.
I hope I'm wrong and you are right. However, here are Two Points to consider:
1. The FBI is not in control of the investigation. They have no legal authority. It's true they could put great public pressure on the Arubans if they wished. For instance, using the Aruban Attorney General's own statement, if an FBI spokemans were to pubicly say "We find the Attorney General's statement very disturbing", that would send a clear signal to the Arubans. The fact that they refuse to apply any public media pressure is due to (2.)
2. The FBI will play this the way the US State Department wants them to. The US State Dept. doesn't give a rat's behind about the lives of American citizens when compared to their desire to "maintain good relations" with our "allies".
You are neglecting to consider, or discounting, the profound influence that many Americans who care may apply to this case. Consider the possibility that it has come to the attention of the POTUS, his wife, and Condi.