So there's a warrant for an arrest but we don't know who until they are arrested, or at least it seems LE hopes to have them in custody by tomorrow.
8 search warrants? Just from looking at SM, I would suspect they could have a warrant to FB for each perp, as there is information to be found there, IMO. Maybe they used other means like twitter, instagram, etc.
As with many cases on here, once police have suspects in custody on charges, they can build the case further, and then add more charges. Maybe that's what is happening here, and as more information is revealed, they will keep arresting people that had knowledge of what was happening, helped plan what was happening, were doing illegal drug dealing, was a perp in the abduction, or/and murders.
It's just my opinion, but I do think we'll see more arrests. Sounds strange so many people were involved, when we usually see a solo act, or 2 people arrested. There's so much that lead up to this situation, and then the abduction and holding hostage aspect, and then the murder aspect. There's 3 or more 'criminal activity' for lack of the right words, and though each activity is linked, they are still seperate activities that have multiple perps.