Point Stealers

I played a six-player doubles game, and my teammate deadbeats early and gets kicked out, leaving me almost defenseless against two powerful teams . Then, I thought I was beat, but played the game out and ended up killing every single other player in the game and winning. Thinking I would get the 88 points for winning the game (which would promote me to the next rank) I was surprised to still be a Private. Then, I saw that my teammate got half of my victory points, leaving me only five points away from being a Sergeant. Is there any way this can be stopped, so that people cannot take points for other people's skill?