Points for teams?!?!?

I have Fnatic as my team(playing in best game format) and they are currently and they are currently showing as having 6 points. Showing that they killed 2 dragons and took 4 towers in a Win..... I'm assuming they got 1 point for each of those 2+4=6??

My Question is wouldn't they have had to kill more than 4 towers to kill the nexus and win the game??? Do nexus towers not count? I feel like a winning team should be putting more than 6 points on the board...