They groomed him for Justine's current role but realized he was a loose cannon so they killed him. That's the conspiracy theory.

LOL that's a little much. If they're the ones choosing the 'leaders', they don't need to kill them off, they can just de-select the guy and anoint the next guy.

They never found his body I believe.

Apparently not.

But look what I found in his Wikipedia bio LOL

was known to family and friends as Miche, a nickname given to him as a four-month-old by Fidel Castro

LOL these fucking people.