So you told us all the places where she didn't exit, so does that just leave the front door? If the AA had a key to the apartment (how would they get that if they were targeting Madeleine?) then he could lock the front door behind him, but without the key the door had to be left open and that has not been described ass the case. So what is your explanation for the exit portal and if it was the front door how did it end up closed?
I dont think that Madeleine exited under her own steam at all. I think she was carried out .... but none of us were there ... and we cant be sure.
All the watching and the timing of Tannerman carrying a little girl so soon after Gerry left, make me think this was a planned and meticulously timed abduction. The safest time would be immediately after Gerry finished his check.
IMO, a watcher/ director was watching the comings and goings from the middle balcony opposite and the minute Gerry walked down the steps and through the bottom gate the watcher signalled the go ahead to the actual lifter/abductor.
Having signalled the go ahead he immediately went thru the building and via the back garden and back gate to the little parking area where a getaway vehicle was parked. The watcher / director was also the get-away driver AIMO.
The getaway failed because he spotted Gerry and Jez chatting on his route ... and also he spotted Jane T witnessing the abductor walking off with Madeleine. He scarpered, driving off down the road in a southerly direction leaving Tannerman in the lurch. IMO
All this is likely given the facts of watchers observed by others, fag ends on the balcony and the very position of the balcony immediately opposite 5A with its view of the immediate approach and exits, both back and friont. Also its direct view into 5A lounge, kitchen and maybe bathroom. It is likely, but as yet, as far as we know, it isn't fact.
OG might by now have proved that it is fact ... or they may not. We dont know.
But the perfectness of this scenario (until Gerry and Jane thwarted it), should be "left on the Table" .... and not dismissed as Gunit wishes.
AIMO