In the mad dash to create theories, much misinformation is instead created.
We know this is, in fact, a homicide...4 murders. Sounds like whoever committed this crime either targeted these specific individuals for whatever reason, or targeted this specific residence.
These murders are not being referred to as a random event, which implies there's some kind of connection between perp/s and victims.
Yes, one person can kill 4 people. Serial Killer Danny Rollins certainly proved that during his reign of terror. At o'dark thirty, victims likely asleep, maybe inebriated if there was partying beforehand, they were vulnerable.
It's best to take what's said at face value and wait for more information instead of making things up.
I trust they'll solve these horrific murders, though it may not be as fast as case followers want.