...Would it have proven that Madeleine wasn't given an overdose of sedative and fell off the balcony? would it have proven that Gerry didn't hide her body later that evening? Utter nonsense.
From your comment I can assume that you believe a conspiracy to deny a body of legal burial is afoot? This theory has been around since the very moment Madeleine disappeared. I am somewhat surprised that after almost ten years people still entertain this despite the evidence that such a conspiracy would need is woefully lacking.
For me the most damning indictment for this premise is that it is hinging everything on the fact that Mr or Mrs McCann, or both suddenly had a complete character change and dismissed basic primeval urges to protect their offspring. Such a massive character swing, and essentially a fundamental character flaw would have certainly been evident prior to and after the disappearance of Madeleine. Prior behavior indicating that they were capable of this would have been so defining that a first year criminal psychology student would be flagging it up. In the rare instance that both parents, as is theorised, were involved then the fundamental character defects would be alarmingly apparent as they would feed off each other and there would be prior incidents reflecting this.
The only way this premise can function through to it's alleged conclusion is if you are willing to take on faith that either or both parents are capable of such disregard for human life and empathy without one single prior incident to sustain it.
It's massive ask, so big that at present without any supporting historical or crime scene evidence I cannot entertain it.