@Shah, you are dropped from the list if you haven't completed a game in the last three months. I am also a re-entry because I did not complete any games in October, November, or December, so was not on the January list.
@hellalt, ghost rating is like points except you contribute based on your rating at the end of the game. If you lose, then you lose those points, doesn't matter how strong the opponents were. If you win or draw, then you get points based on how strong the opponents were. (Or survive in PPSC.)
@HR, I believe they do not count. I believe it only looks at fully completed games. But it is theoretically possible that it could estimate the loss of rating based on your current rating, although the actual loss is determined based on your rating when the game has completed. It would be really messy because it would have to refactor previous months and such, so I would bet that it does not.