These "management" accounts that people have been creating are against the new account rules where you are not allowed to make another account while unbanned.

http://www.serebiiforums.com/showthread.php?t=529222

If your league has these as the original posters, then you will have to pick a leader that will manage that post within 48 hours, as the management accounts are going to be banned. Any new leagues that appear with these accounts will be denied automatically.