OC run a night creche. The resort is self-contained therefore most are unlikely to have bothered with hire cars.
How would we expect children collected from night creche to be transported back to accommodation? The children were too big for prams/buggies and therefore were simply carried. What is that arouses suspicion? Would the same suspicion be aroused if those doing the carrying were female? It seems to me the father is doing the carrying simply because he is physically stronger and the child is likely to remain more comfortable in his arms and asleep than if the mother was doing the carrying. The children being carried might be younger siblings and the mother returned to the accommodation with older siblings.
Imo these sightings have no relevance to MM's disappearance and are simply red herrings.
I don't believe anyone would abduct a child, or want to dispose of a body, and walk around so blatantly unless they were suffering some mental illness and/or learning difficulties. And the way in which MM disappeared would suggest to me the perp suffered neither.