But he says Holloway's mother, Beth Holloway Twitty, remains steadfast in her belief that suspect Joran van der Sloot and his two friends, Deepak and Satish Kalpoe, know more than they're telling about the disappearance of her daughter.
Natalee has been missing more than two months.
"I don't know if they killed her. I don't know if they traded her. I don't know. I don't have any idea,"
So she's starting to spread her message to neighboring countries like Venezuela and Colombia, says Natalee's mother, "just in case they somehow managed to get her off this island."
Natalee was last seen at a local nightclub with van der Sloot, the only suspect still being held in connection with the case, and who Twitty says had a reputation for buying girls drinks, according to one young woman she talked to.
"He just leans across the bar," Twitty says. "The bartender lines up four shots of 151. These girls had no idea. It makes me wonder, is that the shot he was buying my daughter right before closing time, a shot of 151?"
Twitty asserts that could "absolutely" have impaired Natalee's judgment.
It's been widely established that Natalee willingly left the nightclub with van der Sloot and the Kalpoe brothers, but Twitty now says she thinks her daughter was tricked.
"I wish," Twitty laments, "Natalee would have been able to see Deepak and Satish Kalpoe and seen that those three were so tightly connected. She didn't have that privilege. All she thought she was doing was getting in an Aruban cab with an Aruban cab driver."
Kirsch notes that, whether Natalee believed she was getting in a cab or in a private car with the three young men is where the mystery starts, but for van der Sloot's mother, there's no question about the kind of person he is.
Says Anita van der Sloot, "He had an academic scholarship. There was nothing that would irk this boy to something strange, because he had a brilliant future in front of him."
But one, Kirsch points out, is an uncertain future at the moment, and even more so.
Right now, an uncertain future, and even more so for Natalee.
"I know someone has some information," Twitty insists, "and I'm just so hopeful. I know it's nine weeks into it; it'll be ten weeks this Monday. But I'm just praying that they will come forward and share (information) with us."