In a dual leadership condition, two leaders share formal power in team decision-making. How to distribute the power between dual leaders in the decision-making process determines team effectiveness. Our research proposes a new perspective to solve the tension between the unity of command and the shared command in a dual leadership condition. We advance and distinguish between decision-participation power and decision-making power. Furthermore, we posit that the decision-participation power gap has a negative effect on team performance through decision-making comprehensiveness whereas the decision-making power gap has a positive effect on team performance through the decision-making speed. A multi-time and multi-source data of 127 dual leader pairs provide support for our hypotheses. Our research discusses the theoretical and practical implications for dual leadership and power distribution.