I think it's really important to find her body to find out if she was given any chemicals ... prior to going into the ocean ... if she really did go into the ocean.
The last real contact from her is at 2 in the morning where she says "this sucks". At 3 the following afternoon, her boyfriend received the "we'll work it out" email. At 6:25 PM she is reported missing. It's been suggested by her boyfriend and others that GVG may use keystroke software and Robyn's gmail account was active for at least a day after she was reported missing.
I suppose he was deleting all the email to and from her on her account? Perhaps between 2 AM and 3 PM the following day, something had already happened ... and perhaps the call at 6:30 about her being missing was an after-the-fact event. But where is she? He had a rental car ... so I suppose she could be anywhere ... in a well, in an incinerator, off the cliffs by the lighthouse ... or in the riptides.
I'm guessing that the FBI will be helpful in tracing all gmail activity, paying attention to post-cruise plans emails, and texting/email from 2 AM Aug 2 on. GVG knew that she didn't have a job to go back to, that she was lying to her boyfriend, and who knows what he knew about her contact with family ... but it may have been that it was sporadic. He may have assumed that no one would really miss her.
He reported her missing, he got a lawyer, he or the lawyer asked if he was needed for any additional questioning and then he proceeded to go to the airport ... where he was detained for questioning pending charges. I bet he was holding his breath the whole way to the airport. In a way, this system seems good today because a suspect can be detained from leaving the country even though the case is not yet solid enough to bring charges.
I'm still trying to wrap my head around the fact that Nancy Grace, the victim's spokesperson and advocate, tried to down play the high risk lifestyle of accepting a plane ticket from a guy on the internet, also suggesting that it was quite normal for couples to meet via social media and to utilize freebie vacations that were assumed to be platonic. What Planet is she on? Social media is extremely high risk for meeting potential life partners and is not normal. Social media is common for people to stay in touch, but meeting strangers on the internet and flying into the sunset is a bit like Looking for Mr Goodbar ... even in the internet age. Utilizing people never works.