There is another thing that bugs me. The body was found at about 11.30 at NIGHT by two "amateur cave-explorers" who were passing by. It's hasn't been revealed if they were Greek or foreign and if they were male or female. They noticed the smell, went in, found the body and called the police in shock.
1) Why didn't they go there earlier in the day? Maybe not in the heat of the afternoon, but 11.30 at night seems like a really late hour to be exploring the kind of landscape seen in the video, unless they were having an affair or something, and were looking for a secluded spot for other purposes. Perhaps they went there intentionally at a time when they knew no-one would be around, to check how the decomposition was progressing, and they noticed the smell was getting too much and it was only a matter of time before the body would be found? So they decided to call the police?
2) There was a 50,000 Euro (56,000$) reward offered by the family for any information that would lead to the lady, dead or alive. The offender may have felt tempted by this generous offer. Maybe the "amateur cave-explorers" had the audacity to not only commit the crime but also come back for the reward? Of course, this is just hypothesising on my part. It hasn't been revealed whether they've received the reward yet or if they will receive it.
***The link
Δολοφονία βιολόγου στην Κρήτη: Το κίνητρο, οι προσαγωγές και η… θεία δίκη posted above says that the two people have provided strong justifications to the police for what they were doing there so late at night.