So IYO he went in through the window, then was warned Gerry was coming so he had to close the window and shutters and scamper off out of the front door? Wasn't he lucky that Gerry didn't go to enter through the front door as he originally testified.
He couldn't have gone far, however, if, as some believe, Jane Tanner saw him with his black hair. If it was him, he raised the shutters, opened the window and climbed back in almost immediately after Gerry left. His accomplice must have thought that was fine, even though Gerry was still close by.
Well if his accomplice was on the balcony opposite as seems likely (superb viewing point and cigarette stubs) and was looking out, s/he would have found it impossible to see Gerry and Jez cos they were beyond his vision. The balcony is set back with the main block 6 building wall on the Rua Dr FGM side jutting out hiding most of the view in a southerly direction. This wall blocked off the spot where Gerry and Jez chatted. The watcher couldn't see them, and as they had a sleeping child s/he wouldn't have heard their hushed talking either.
Please note: You have to enlarge GEarth to its maximum, draw lines understanding perspective, and study it very closely to see how the view from the recessed balcony is cut off by the jutting out wall of block 6. Gerry and Jez in the kerb and road would be totally out of sight.As far as his accomplice was concerned, Gerry had gone back to the restaurant and it was time to let the abductor know and go out to the little car park opposite the Tapas reception to pick up the getaway vehicle. The abduction would have taken less than two minutes, imo
All the above is theory, but it all fits perfectly