A question about Halo 3 lone wolves?

[Satellite]

Alright, so a game starts with 6 people, and only the top 3 progress. If the bottom 3 leave the game, do the 3 remaining players still progress? Or would it become the top 2 or 1 that will progress while the bottom 1 or 2 recede?

 

[Man with Skillz]

I believe the 3 remaining all progress, but 3rd does a bit slower. unless there's a 3 way tie, lol