What do you mean by this? "It changes Smithman's point of view radically." What are you able to go inside the mind of Smithman?
The view that is widely discussed is the Smith's view. Specifically that 3 Smiths - Martin, Peter, and Aoife.
It's as if Smithman passed 3 people that night.
Except he didn't. He passed 9 people.
So what did it look like from Smithman's point of view?
For example, if all 5 children were together in a gaggle with Aoife, he would have seen a group of 5. Further, there is a slim chance that one of the parents would have looked back to check on the children, and in so doing would have seen where Smithman went next.
Brietta has suggested a layout that makes it Peter + Wife + 4 children, then Martin and Mary, then Aoife on her own. That is a very different layout.
Personally, I'd go with Aoife, the 13 year old and the 10 year old in one group, but I have no evidence to support this.
Where the 4 year old and the 6 year old were is equally unknown.