To Rehost or not to Rehost?
Rehosting is sometimes compulsory and sometimes optional. In either case it often happens that one of the original players gets bumped by a new player coming in. This is clearly unfair and very annoying when you are the bumpee. I suggest it be an unwritten rule that no original player be bumped. Often the new player is not aware that he is bumping someone. Consequently the host should ask that person to leave so that the original player can come back in.
Problem? The only problem with this suggestion is I have found when a person joins then leaves a host the game often gets screwed up.
Consequently to avoid both problems I personally recommend not rehosting if it is simply to let a late-arrival join.