I'm going with Greta's instincts.
I'm happy to see her going in the direction that maybe the boys didn't kill Natalee because
(1) that gives me hope Natalee might still be alive
and (2) it's dreadful to think such seemingly nice young boys might have done such a terrible thing -- though I know Robert Chambers did.
(Though Robert Chambers might not have been quite what we thought he was. After posting his picture here next to Joran's, I did a little research on him. Linda Fairstein, the prosecutor who convicted him, complained that the media portrayed him falsely: He wasn't really the nice boy scholar type, but had already dropped out of school, was taking hard drugs and running with a tough crowd before he murdered Jennifer Levin.)
So Greta's my weathervane. If she starts pointing toward the boys my heart's going to sink. Prayers for Natalee and her parents.