I feel that I can dismiss as a suspect, any person who worked for the Shermans and may have had access to anything regarding their schedule, or keys to their house. The only benefit of a staff member knowing their schedule, or having a key, would have resulted in a major robbery, which didn't happen.
I don't dismiss any person because they have an alibi of being out of town when the murders occurred. I am not suggesting that they are involved, but they are not cleared imo if this was a professional hit.
Greenspan believes that the Shermans were targeted by professional hitmen. True or not, I don't think the killers needed inside knowledge of Honey's itinerary. They only needed to know that staff didn't come at night. They could deal with any unexpected visitor.
The Sherman family and friends reported a list of persons of interest to LE. It would be interesting to know if anyone reported a POI specifically in regard to Honey. The TPS have made it it clear that this was a targeted double homicide. I think that implies that both were targeted. IMO, that denotes that the killer, or mastermind behind it hated both of them, or didn't care if both of them died as long as the intended person was killed. That could be a deliberate double murder, or a hired killer with no qualms of getting the job done and eliminating any witness.
It seems to me that if HS was the only target they could have just done it when BS wasn't home, and then leave. But it doesn't make sense to me that a professional killer would risk potential exposure by going to the house, staying there for a while, potentially leaving clues, etc. Similarly, if BS was the only target, BS could have been killed elsewhere much easier and with much less risk to the killer . IMO they were both targeted as casesensitive says. I don't believe only one was the target, and the other was just in the wrong place at the wrong time. Someone planned to kill them both, in a very close personal and in your face way, in their home- the place where most people feel the most safe.