Wrong. The objective of control is to get more points than your opponents. Kills give points. Kills with modifiers give more points than a basic kill. Modifiers include number of points controlled, proximity of kill to a control point, use of heavy weapon, multiple kills, etc... Yes, two zone kills give more points than single zone kills. Making it more efficient and easier to win. But single zone kills still give points. So... a team with only one point but with significantly more kills can still win. If team a defends one zone and team b walks into a controlled death trap repeatedly and dies repeatedly, team a wins based on kills and defensive modifier bonuses.