After reading the article, I still don't know much about the brothers. One was studying mechanical engineering and the other was studying aerospace engineering, but no mention of college for either one. The one brother who was flying out missed his first flight, but family raises concerns that there is no way he would miss a flight (twice). No-one seems concerned with who he was going to visit. When their father can't articulate a name, there is no follow-up.
I would be most interested in what information is present on their phones. Text history, map searches, GPS data etc. For them to have been "lured" to a strange place, there should be a digital trail.
Since almost all of our information comes from non-custodial family, and almost none from third party sources. I don't have much to work with.
Autopsy results and phone histories should answer a lot of questions.