I think it is hard for people in the U.S. to understand how people, including tourists, might react in a part of the world where it is more common for people to be kidnapped for financial ransom than it is here in the U.S. Today in the U.S., we are more likely to think of kidnapping as involving women and children for sexual purposes, or non-custodial parents taking children. The days of the Lindbergh baby and the J. Paul Getty heir seem far away, although I am certain that the very rich have serious security today for themselves and their children. As a woman and the daughter of a prominent man, Stephany could have been a target for either type of kidnapping; Garcia, however, adding two and two and getting five, made the connection to his acquaintance who failed to show up for two appointments. We should be glad that he called to ask that Joran's room be checked, if that is the case. Or it might be that Garcia knew more about Joran's past than we are aware of or that Joran had bragged of past exploits with women to Garcia. That would be entirely consistent with what we know about Joran from the tapes we have seen of his "confessions". In that case, Garcia might have added two and two and got exactly the right answer: Joran had killed again.
So long as LE can prove Garcia didn't enter that room (there would be video) it won't matter why he told them to check. If Joran got caught because someone was concerned about him, how ironic. If he was caught because of his bragging and narcissism about his exploits with women or because of his notoriety because of Natalee's disappearance, how apropos and just.