The second housekeeper was told twice not to come, is that correct? First on Wednesday, she got an actual call from husband, saying everyone is sick, don't come tomorrow, and please tell the husband of the second housekeeper that her phone is dead and she is sleeping over.
Then the next morning, a text making absolutely sure she does not come.
Now that's odd to me too. The perp had already put her off and had all night to do whatever he planned. Surely, that's plenty of time to get out by the time she arrives the next day. Why would he care who found the bodies?
Why did he need to stay so long? So long that it required another call?