This seems to be the MFC's evidence at the inquest:
"He left the house at around 9am on the morning of William’s disappearance, in his “fairly new” 4WD.
He told the court he needed to conduct a business meeting by Skype, in an area with a better internet connection.
He sent a text from the car shortly after 10am, saying he’d be home in five minutes.
He pulled into the drive, and his wife — William’s foster mum — asked him: “is William with you?”
He replied: “No, why would he be with me?”
When his wife said she couldn’t find the boy, he “very quickly” started moving.
“You didn’t stop and have a conversation with her about where she had already searched? Is there any reason for that?” said the counsel assisting, Gerard Craddock SC.
“I went the path of least resistance,” the man replied.
“I searched every day,” he said. “Every day. My wife and her mother stayed home (caring for William’s sister) I went every day.
“I had to do what I had to do. I had to keep searching.”
The court was shown an aerial scene, which showed the house in which William had been staying.
It is on a corner block, and set well back from the street.
The street becomes a dirt trail, which leads up to the local bush cemetery.
That trail is four wheel drive only.
“Did you believe that William was out there somewhere, and that you’d find him?” Mr Craddock said.
“I had hope. I had hope,” the man replied, but he didn’t believe so small a boy could negotiate the trail up to the cemetery.
“Did you search around the cemetery?”
“On several occasions.”
BBM
So if this is correct, he was back around 10.05am according to this and WT was already missing! This is different to what we have heard so far.
He searched around the cemetery "on several occasions", so he was not as convinced as some people are that WT wouldn't have gone there.