There is a suggestion the abduction is staged,the unlocked patio door lends itself to this as well.
The unidentified finger print is important to posters not the investigators,I'll repeat do you seriously think £12 million of brit money has not got beyond that.
There was much more than a 'suggestion' more I would say of a fixation of the man who initially should have had an open mind but chose instead to theorise and publicise his theory to the exclusion of all others at the time of Madeleine's disappearance and in all the years following.
Hardly surprising his investigation failed to meet with simple solutions which obviously met with the evidence which he had overlooked in pursuit of the discredited theories he espoused and promoted.
Scotland Yard and the Judicial police separately reviewed Madeleine's disappearance and found enough neglected evidence to reopen Madeleine's case in 2013 which remains open and active till the present day.
So that evidence suggests that there was evidence of abduction which was found when looked for but when the wrong investigative track ruling out abduction was followed by investigators in 2007 evidence wasn't looked for and therefore although existing was not found.