So we had a player disconnect from the game, we waited a while for them to come back but they didn't so we decided to vote to kick. Tried it, the screen pops up to initiate the kick, click confirm then nothing... the other members didn't get the pop up. Tried swapping leadership, still nothing. Tried it on an online member and it works. So it would appear you cannot vote to kick a disconnected player. Also couldn't find a replacement while they are DC'd so Flashpoint had to be abandoned.