A hired Faction member or a Story Mission ally's leader skill will stack with your own team's leader skill. The bonuses remain in effect even if the character that grants them is killed. The leader skills are added one after another (and NOT together at once) Proof (Best proved with +?% HP Leader Skills): * Shane - Days Gone Bye Leader Skill (All teammates get +15% HP. They also get +20% defense against ranged characters) * Shane - Days Gone Bye Rank 3 Level 60 HP: 973 * Shane - Days Gone Bye 973 + 15%: 1119 * Shane - Days Gone Bye 1119 + 15%: 1287