One of the inerrant problems of Group RPs is managing all the players. Its hard enough in one-on-one games and RL always kicks in at rather inopportune times. Waiting is certainly necessary at times, but so is moving on...at least, progressing the game. Those that are being waited on can catch up and rejoin the action (as I plan on doing). I would suggest getting things moving again ASAP while adding on the other people as things keep rolling.