Speaking for myself, I think my resistance to anything "complicated" is because complication = planning. It's hard to accept the idea she might have planned this, rather than his disappearance being a spur-of-the-moment cover-up.
Both are horrible, but intentionally planning his disappearance is beyond evil. And it's easy to resist thinking that level of evil is possible, especially by someone in a mothering role.
I lean toward all this being a hurried cover-up, but I honestly don't know what to think.
jmo