There is a metaphor of dota ---> BP progress of dota2 decide the spirit of the team, if the spirit is harder and valor then the game is radically easier. However, the whole game play is the body of the team.
|| Mid lane is the head which decide the speed and rhythm of the whole team. Carry is the heart which decide the death of the whole team. (--Erbus) || Support and the offlane are the forlimbs of the body. They protect the team and make effort to maintain the sustainability of the team. If a team want to win, each part have to be there. Partly weakness means partly strength exist in the other part. The whole team need to work together to win a game.