In my ignorance I'm assuming inquests happen when the facts of a case are not completely straight forward and investigators have exhausted current lines of inquiry.
A coroner may recommend further investigation if there are inconsistencies where things don't entirely add up (and if the murky information that has been released publically in this case is anything to go by, it won't come as a huge surprise if the investigation remains open following the inquest IMO).
For one thing, if witnesses are to claim he left the hotel to 'source drugs', I imagine it would be important at the inquest establish who he intended to arrange the transaction with, or determine whether the allegations have any basis in truth at all. If he did meet with others after leaving the hotel it clearly opens up a number of possibilities. And if the buying drugs allegation isn't conclusive, it could also bring into question those who have made the allegations.
Will have to tune back in late November. Maybe by then there might be a few concrete answers.
here's something about when an inquest can be held.
http://www.armstronglegal.com.au/corporate-crime/coronial-inquests/when-can-an-inquest-be-held
and
"Can I ask for an inquest to be held?
A relative (or person whom the Coroner
determines has a sufficient interest) can
request that an inquest be held. The written
request must clearly state the reasons for
the request. The Coroner will consider those
reasons when deciding whether or not to hold
an inquest."http://www.coroners.lawlink.nsw.gov.au/agdbasev7wr/_assets/coroners/m401601l1/coroners%20ct%20brochure_guide%20to%20services.pdf
"What is an inquest?
An inquest is a court hearing where a Coroner
considers information to help determine the
manner and cause of death. At this hearing,
the Coroner may call witnesses to give
evidence about their knowledge of the death.
Any person who, in the opinion of the Coroner,
has a sufficient interest in the inquest, may
apply in writing for permission to appear (or
to be legally represented) at the inquest. This
person may ask relevant questions of any
witnesses.
Inquests are generally open to public viewing,
except for certain situations when the Coroner
can exclude individuals or the public from
attending. " ibid.