I believe the leaders tab shows that there are sailors available for a promotion, not the number of leaders on board. It is a little bit misleading as one would think, like you did, that the slots needs to be filled up in order to have a full crew complement, like the other 2 icons above for officers and sailors. Instead, it is only for your information. I recall reading this somewhere, either the tutorial or some video, I might be wrong though as I am also new to the game
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