Yes. Also:Didn't FFC say in her statement that she was searching the property and calling out William's name? So why didn't Grandma hear anything or see FFC searching ?!
After remaining seated 'for some time, then I didn’t hear from her, I got up and followed them down.' BBM (from today's article)
Compared with this from an interview with 2GB:
Interviewer: And what was the time between when you last him and when you realized he was missing?
FM: Ummm .. there’s a big gjassy grassy clump of grass and I thought maybe he’s hiding in that, and I raced down there and I raced back up again and I think Mum must have heard me yelling out for William because she’s standing up and I walk back around to where we were sitting and she’s standing and I just said “is he here?” and she said “why would he be here?” and I said “well, I can’t find him” and she said “what do you mean, why can’t you find him?” and I said “he’s gone”
And this
When he fell quiet and the foster mother could not find him she told her mother, “I can’t see William” and her mother replied, “Oh, the little devil”.
What FM has relayed is completely inconsistent with what FGM is indicating in the walkthrough. According to FM, she went back to the patio and spoke to her mother there. According to FGM she had to wander down looking for FM.
Also I note in the quote I posted from the 2BG interview (which BTW has been in the WT threads before as that is where I found it) that FM actually says as part of her story about going back to the patio that "Mum must have heard me yelling out for William", which ties in with your point. So we also have FM claiming she was yelling and FGM indicating it was because she couldn't hear anything that she went looking.
Just.....what?