In order to bring out the truth don't you have to look in the right places? Shango says the 3 amigos are scapegoats. I don't think they know where she is...dead or alive. Or, if they do know I think they were tasked with disposing of her, but they may not have been with her when she died. I think Joran and Deepak were headed to the Wyndham that night/early morning to try and get her back...alive. They may have been too late.
Or...it was decided that she would be taken off the island and sent somewhere else...(the sex slave theory).
There is a connection between the Allegro and the Wyndham. There is a guy who has held a high position at both places. He has a middle eastern name. The two security guards were former Allegro security guards. They hung out there. Lkie M. Furhman says, there's always a hint of truth in the lies. Joran didn't correctly describe the clothing of the HI security guards. He said they wore all black. The HI security guards wear white shirts. He was secribing security guards from a different Hotel/Casino. If by chance they were seen at the Allegro, those two security guards could still be suspects.
I study the medieval period and I like it...and I like William of Ockham's neat little theorum. But it really doesn't fit complex cases.
I prefer what Conan Doyle said through Holmes (to paraphrase)..."remove the impossible and what you are left with is the truth."
As a fanatical fan of mystery...we need to see the underside of the island to see the truth.
Even in riddle, shango has made the most sense.