It seems fairly obvious from the Police interviews and their actions, that they seriously consider that Madeleine McCann is dead. Has this been communicated to the Parents we wonder? Or, will they still continue to believe in her being alive with a chance of being found?
Should the Current or future searches discover the body of Madeleine it is only a remote chance that they will get any clue as to who was responsible. Although there may be a clue as to how she met her demise, such as a bad head injury or marks indicating such as strangulation, there will be no direct link to the killer or the ones who hid the body. However, such additional information, put alongside the original evidence gleaned by Detective Amaral's team, could lead to establishing what exactly happened and who was responsible!
Or is that unfair? What do you think?