yep One of the issues with the game balance is the over reliance on teamwork. Losing just one member at that skill level in most cases is all it takes.
Also Mistakes tend to happen in bursts. One person fucks up and its like a chain reaction as people try to compensate for that mistake and make mistakes themselves. that definitely doesnt help.
Edit
This last man standing shit however may have presented a solution. But I need to gestate it more before putting it out.