Look, I'm all for people having a go, even, as Sadie has, going and touching and sniffing, which is commendable in itself. But I also believe that all rational thought is dispensed with once a theory has been decided upon and dogma takes hold.
I don't believe a crack band of abductors positioned themselves in an overlooking apartment waiting on their prey. If this unlikely scenario were to play out, this highly organised unit would not be faffing about observing anything. Certainly not hiring a holiday let in the name of K Templar, Rosslyn, Midlothian. As for procuring a special key from a complicit member of staff? The back door was literally open. Our elite grab team didn't deem it necessary to check if the doors were unlocked?
G5J was not a holiday let managed or cleaned by Ocean Club. IMO it was a privately-owned apartment & details are not in the public files.
https://www.mccannpjfiles.co.uk/PJ/5A_CLEANER.htm*snipped*
Upon being asked, she states that she is a cleaner and has been working as such for around 13 years with the company 'THE OCEAN CLUB'. Her two daughters, FM and DI work with her in the same department.
Regarding her job, she points out that she is the person who is responsible for cleaning Block 5, more specifically apartments A, B, C, D, H, I, K, L, M and P, and also states that when the child disappeared only apartments A, B, D, G, H and K were occupied.
Furthermore, no keys were available for G5J at OC as the PJ had to force entry via a rear balcony window.
As far as the keys to 5A are concerned (and possibly G5J) cruciform "jiggler" skeleton keys can be purchased over the internet. There are reports Paulo Pereira Cristovao's housebreaking/robbery antics were carried out in association with a locksmith's assistant, who is currently serving time.
IMO it really wouldn't take long to plan & execute the abduction of a child once the target had been selected, especially in the relaxed environment of a quiet holiday resort.