I think the problem is there's no clear favourite, like Connie, Lee and Jessie in the previous series (OK I know Jodie won, but Jessie was the favourite), so the votes are probably fairly evenly spread. I bet if they showed the percentages at the end of the series there wouldn't be much between any of them.
I don't understand why ALW thinks this lot of girls is the best yet, I personally don't agree with him. The Marias were much better as a group, some a bit useless, but most very good, same with the Nancys.