In the in-game gui, there is a circle near each allied portrait. I've seen it be either gray or green; what is the meaning of that circle? As far as I know, it's not saying whether the friend is connected. (On that note, how can I find out how many players are currently playing in game? (i.e., how many are disconnected?)
In this picture, the first circle is black/gray and the rest three are green.