This is what makes David Payne, and Mathew Oldfield's respective 9pm checks interesting. Since both of them talk about listening at the shutter of the McCann siblings bedroom window, situated on the road / car park side of the building..
For some reason Gerry McCann takes offence to these checks having been carried out on his apartment..
At one time or another, Gerry McCann claims to have entered apartment 5a by (1) the road side door, and (2) the sliding patio door on the poolside of the building when he allegedly carried out his version of the 9pm check on evening of Thursday, 3rd May 2007...
So, Gerry McCann entered apartment 5a at the time of his 9pm check, via the lockable roadside door, and the poolside patio door...
Infact, the following might be true..