I don't think Kate had anything to do with Madeleine's disappearance, therefore I don't see how answering 1 question or 20000 questions is going to reveal Madeleine's whereabouts or fate. I DO think the PJ were hoping to get Kate to incriminate herself so that they could have grounds to press charges. My opinion. Please stop your insinuations that I care nothing for Madeleine's fate, you are wrong and are being offensive IMO.
I have a list of questions that Kate and Gerry could answer, that would help in the search for Madeleine, and that have no potential to incriminate the McCanns.
Here's 3.
Was the OC driver who ferried them from OC reception to 5A younger or older?
Did the said driver enter 5A to help them with their luggage?
What route was taken to get from reception to 5A on Sat 28 May?
The first relates to when the said driver first clocked Madeleine and then connected her to 5A. Tick-tock on a planned abduction.
The second relates to whether the driver's DNA might be amongst the unidentified DNA retrieved from 5A.
The 3rd is a check on whether the traffic routing was normal or not. In addition, it relates to whether the first GNR unit drove past 5A to get to the OC reception on 3 May 2007.
The McCanns probably have little idea of the importance of these questions. Perhaps Op G is better informed, though I have no great hope.
And absolutely nothing in there to incriminate the McCanns.