Aisling's body was found at No. 5 Longburn Rd, just metres from the home of Aisling's deceased grandparents at No. 7, where her mother was working when the toddler disappeared.
Questions are now being asked as to why, after an extensive search, the body wasn't found more quickly.
Waitakere Mayor Bob Harvey says he thinks she may have got into the drain through an open manhole and he believes the manhole cover must have been replaced later.
He says that manhole cover is far too heavy for a man to lift, let alone a child, but it must have been removed at some stage as it's the only entrance to the pipe.
"We have searched and not found her, which makes it more likely we are looking at someone having picked up Aisling," he said.
"As far as we know, we believe Aisling hasn't wandered off."
At a press conference on Tuesday morning Davey says the drain where the body was found was repeatedly searched the night she disappeared, by police, search and rescue, and Aisling's father.
Later, Watercare cameras were put down the drain and they couldn't see her either. It took diggers sent in to check again, to reveal her body.
He says he personally thinks Aisling has been in the drain since she went missing, and he believes her death was an accident.