Unfortunately the way Diadem works prevents the vote kick feature at the present time. It works (roughly) like this - the duty finder will place up to 9 parties per instance (72 people). If a player leaves there's still 9 parties there in the system's "eyes". This also means that FC airships can enter with a party of less than 8 members & not be split across any empty spaces in parties already there. The downside is that it's possible for a full Diadem to have 9 parties of only one player each if the rest leave. No help is coming as the system says the requisite 9 parties are there!
I know that's a bit of a cat's vomit explanation but hope it makes sense.
