Very good point. I got that same impression from their behavior Saturday morning, with Damon's "Oh well, we still have the two boys to raise" and their utter lack of worry. But it might have started on Friday.
It is possible Danielle disappeared FRIDAY. We have only the WORD of PROVEN LIARS that she was HOME after 3pm on FRIDAY.
PS Danielle's constant wearing of this choker thing reminds me of the girl in Florida who was killed in 1989 who always wore a necklace like that that seems to cut her head off from the body, or like saying "choke me along this line."