I think there is a good chance that we need to prepare for the fact that there could be no certain information that Suzanne is deceased. But that there is a whole lot of circumstantial evidence - when taken in sequence - that says that this is the case.
Possibly no large pools of luminoled blood, no large pools of blood on the underside of a carpet, no smoking gun, no gun residue on hands ....
The defense could be indicating that this is one area that they are going to use to try to create reasonable doubt.
"Because no-one has heard from Suzanne in over a year doesn't mean she is dead."
"Because our client used great amounts of chlorine to clean himself doesn't mean she is dead."
"Because bleach was smelled in the hotel room (and in the house?) doesn't mean she is dead."
Etc, etc, etc .....
Not saying that this is right, but they will use any tactic that they can think of to try to create reasonable doubt.
The best thing possible, at the moment, would be for Suzanne's remains to be discovered. Then that argument would be cancelled out.