"Why do you think Airbus wanted to do PAX evac by analysis? Even they are a bit afraid they may not make it or maim or kill somebody to certify it...."
B747FOCAL, they may have wanted to use computer simulation but they weren't allowed to (correctly) so if and when the airplane passes the test it will be every bit as valid as the B747.
Will the upper deck slides on the A380 be single or double width?