I was looking for the thread where we were discussing whether or not JT returned via the front or the back when she observed JW/GM chatting and 'Tannerman' but can't readily find it so I'll post it here.
I've only just realised when JT returned on this occasion ROB was already in 5D as she went to 'relieve' him so the question of whether or not 5D was left unsecured at this time doesn't even come into the equation. What reason would she have for going round the long route into 5D when she could nip up the back passage?
It is sometimes difficult to understand why those T9 were not tied down collate actual details to check if what they said- matched what they said. This is why the Portuguese wanted a reconstruction and why the T9 didn't. They claim it wouldn't help find MBM how the hell would they know? they were not in receipt of all gathered statements from witneses other than T9. They did poor Maddie a diservice IMO.