Possible but not probable. If Madeleine was in fact taken then whoever did it was monitoring the parents movements. As Gerry claims to have seen Madeleine around 9.15pm whilst on his last visit to the apartment then the abductor had to have made his move after that time. Had at least one of them stayed put in the apartment then I believe Madeleine would not have been taken, assuming again of course that that is what happened.
Moral of the story is, do not leave young children unattended for any length of time.
@John. Is distance or predictability the more important factor? Assuming an abduction.
The distance gives the abductor a 30 second plus head start, which seems a fair safety cushion if this is what happened.
The predictability (interrupted by a child's sickness) gives an alleged abductor a feeling of relative safety.
If they had mixed and matched, an evening in Tapas, an evening in the Millennium, an evening on the balcony, an evening taking the kids outside of the Ocean Club for a meal, would this alleged abduction have happened?
No, wrong question. Would an abductor have tried this if the McCanns had a non-predictable routine?