First question i see is:
"Welcome to the Express Entry Assessment. Could you give your full name please?"
Why do you need real name? It's not official calculator, right?
IMHO that should be counted as 6 wives.
I was thinking of different scenario:
if his wives has the same rights as he has - one of his wives can have 2 husbands.
So if we look at it this way - he has 4.5 wives indeed