Wouldn't that have been up to those gathering the forensic evidence?
I'm not really sure what people were expecting to find on Maddie's bedclothes?
Unless, perhaps they are thinking maybe the abductor assaulted her in bed, but there were no reports of blood stains.
I suppose he could have left a semen stain, but then that complicates the Tanner sighting as being the abductor really.
Maddie lay undisturbed when Gerry (claims) to have seen her at 9pm (although, the abductor was already in the apartment then) Gerry spends 10 minutes in the apartment & as he leaves bumps straight into Gez.
Tannerman is seen walking past a few short minutes later, & Maddie is apparently sleeping.
So, I can only conclude the abductor left the wardrobe as soon as Gerry left, hastily made a semen deposit on the bedspread, opened the window & shutters, & climbed out whilst carrying the sleeping Maddie, all within a matter of about 5 mins.
I mean, it's not impossible I suppose.