ArmChairGeneral wrote:8<
The stack bonus is .05 x rating x off/def firepower; the division commander's bonus is .03 x rating, off/def firepower.
8<
That is a little ambiguous. It should be written: '.05 x rating x {off. firepower|def. firepower}', where {off. firepower|def. firepower} means ONLY ONE of the variables is used, depending on the Posture of the stack {Offensive|Defensive}. It is not 'offensive firepower' divided by 'defensive firepower'.
Also, 'identical bonuses' do not stack. Unique bonuses do stack. EG considering a stack with 2 leaders and 3 Cav elements. Of the leaders one has the Cavalry Leader ability, while the other has the Surpriser ability. Both leader's abilities will come into play in combat, if the conditions are met for both abilities. If both leaders have the Cav Leader ability, the Cav Leader ability will be taken into account ONCE during combat.
Consider it a list with a checkbox; you only need to check it off once, until it has been checked off.