Always the voice of reason, Miss James.No worries.
They can take several paths at the same time. They could be looking for a live Baby Lisa at the same time they are looking for a body.One doesn't rule out the other,IMO.
They have to consider both scenarios .JMO
Obviously, the facts, as presented by the family, lead many to think that some kind of accident occurred in the home and then a cover up but one still has to consider that an opportunist, who knew that DB was dead to the world asleep, came in and took Lisa. BUT, that someone had to be very familiar with the home, the family dynamics and habits as well as the fact that DB might have left the home unlocked and accessible.
Time will tell.