I've read one in his 30s and one in his 40s. Bit strange for men of that age to want to hang around a young man they barely know.
So perhaps he was of use to them.
This guy Jay is 19 right? When it was first reported it was saying he was 14 in many articles.
I absolutely don't think they had anything to do with it but it is a bit strange especially as one of the guys was driving so presumably not drinking much or on drugs, why would you want a 19yo tagging along to your remote airbnb.