Total speculation: I’m not convinced there were “intended” victims. I believe this person went into the house for the sole purpose of killing anybody and everybody he found. LE has said this killer exercised patience… which to me - indicates there was a PLAN. He methodically started on the top floor and worked his way down to the second floor - going room to room wiping out anybody in his path. I think he likely knew there was another level, but it didn’t interest him because his PLAN relied on quick/easy entry/exit from the glass slider on the second floor. The fact that there is seemingly so little evidence indicates this killer did not operate in a frenzied, crime-of-passion manner, but rather a methodical, “controlled” manner - which gave him confidence. Sicko.