Question about Vote Chess

I'm in a lot of Vote Chess games (I really like Vote Chess).  On the "Team Members" tab, in addition to the list of members who have signed up for that game, you also see something like:

Team Members: 16
Team Average Rating: 1409
Opponent Average Rating: 1820

But in a lot of the games, the "Opponent Average Rating" is not there.  I can always see our own team average, but sometimes I see theirs, and sometimes I don't.  Why is this? 

Also, after the game is completed, does the "average rating" continue to change as the members ratings go up or down, or does it lock the average at the current value (like in a tournament where the rating displayed is the rating you had when it started rather than current rating)?

I'm in many vote games that are many moves into the game (so they must have players) and yet I can't see their average rating.  In one game I could see their average while their first few players joined, and then the stat disappeared.  ???

Maybe they voted not to disclose the average?