A lot's been written about sightings of a man carrying a child the night MM disappeared.
If I was about to write a fictional police book about a kidnapping under those circumstances I'd never put a man carrying the child. I'd consider screaming and child agitation a great danger for perpetrator. So I'd put a car waiting right next to apartment to go away in a second.
You have only 2 choices: either they carried MM to a home nearby, and they could go by foot, or they carried her far away, and they needed a car.
My question is: the second choice is by far more probable. So why should they park the car far from apartment, especially when they could park it right next to apartment?
So, those sightings must be false leads, wrong persons, illusion, lies, and so on.