Maybe this list is spread by Mnet itself. So the fans of 1-9 members will get complacent. And fans of 9-18 will spend extra time to vote for their faves in 9-18 list.
Hard to believe they Mnet will not take Japanese and Chinese members in the group when they will definitely bring a lot of album sales and concert revenue. GP999 from what everyone have said is not doing that good in korea so there is no reason to have 8/9 korean members when you can have 5-6 who are the most popular for korean fanbase.