I love the 2v2 tournament, it's a lot of fun. After participating my initial thought is that you should not be able to rally off a finished opponent specifically in the 2v2 mode.
Say both teams each have 1 down person. The one who gets finished first pretty much guarantees the match because it rallies the enemy and makes it 2v1 instantly again instead of 1 down and 1 up vs 1 left alive. It seems like it would be more competitive without the ability to rally, give the team who only has 1 person left a fighting chance to still get a victory.
Just a thought.