Ok were they staying somewhere they could see T9's comings and goings at night? If not I doubt it.
I don't believe OC/MW employees were involved either as its extremely unlikely they would know apartment was unlocked. Most would not take the risk of forcing entry and there's no evidence this happened. Taking keys without permission doesn't add up when it just so happens that MM was imo abducted from an apartment that all concerned agree was unlocked.
Likewise the reservation booking at tapas stated T9 wanted to be close to the children for checking nothing about an unlocked door. And this applies to the likes of JW/BO whereby GM shared knowledge of his nighttime "childcare arrangement" he did not say we enter via the unlocked patio door.
The perp imo was someone who knew they could gain entry via the unlocked patio door and this narrows the field considerably.
I believe, and in my opinion that, the couple who now have Madeleine, were not the people who abducted her. And might not even know who this child is, if Madeleine was immediately taken out to sea, having been handed over by The Abductor.
I do have opinions about who The Abductors were, but these would not be acceptable on this Forum at the moment.
I remain totally gob smacked by the nastiness. But I ever remain hopeful that I can deal with this.