Here's a thought: think maybe there was not as many axe wounds as they thought? Considering that there wasn't alot of blood, maybe it wasn't 40 wakes to one and 41 to another.
There would have been blood all over the place. Just a thought
Snokkums...check out these two links from the website. These are the autopsy seports for Andrew an Abby. You can get a better idea about the number of actual wounds, etc..