I think the abandoned deposit should go to those who played it out. If I lose because a player went CD giving the game to someone(s) else, then that share of the deposit is what pays me back for my investment.
Regarding refilling to 100

, that is a bit of an issue. If you refund the deposit when someone is eliminated, that would be the time to refill to 100

, but you don't know if they are going to get some extra points or not due to a CD. If you hold the deposits and refill until the end of the game, then no problem. But that ties up points.
I'd lean towards letting them have the extra points. If the deposit is big, then they won't be getting much of a refill after they get their deposit back. If the deposit is small, than any points they get at the end of the game when the deposits are split up will be small. A little something extra to say, "I'm sorry your game was fucked up."