Maybe Birkhead is a lot slicker than we gave him credit for. Ya know he let a lot of important stuff out of the bag during the burial hearing, but he did it in such a fashion that it wasn't immediately obvious what the implications of his statements were and they didn't come off offensively. For instance, the comment about the duffel bag. Like "whoops. that just slipped out."
1. Anna had to have life sustaining lucid moments. (Her call or email to get her stuff out of the Horizons) Howard ASSUMED that he had tempered any suspicians.
2. Daniel was found in his mother's bed. It looks good on paper but she had just had a C-section. And how out was she that she wasn't startled by Danny?
Isn't it odd that Danny and Anna were both found dead in bed. No bumps, no bruises, just drugs. (I think they may go back to look at the photos of Danny and photoshop it to show how two bodies would fit in that bed.) I'm sure Howard helped immediately helped Anna from the bed.