[ender]

When level up, leadership=level_of_hero * (60,50,40)
Now until level ~15 is better not to chose leadership upgrade (chose between 1 attack and 200 leadership?)
After level ~15 leadership is best (1000 leadership better than 1 attack)

Maybe if hero can have another atribute (like attack, def, int), call it commander_stars (and a title like 5 stars=colonel, 9=general, 12=marshal, from army command structure)
When level_up you can get one commander_star (like you get 1 attack, 6mana, 6 rage)

total leadership=level_of_hero*command_stars*(60,50,40)+ leadership_from_items_flags_skills

in this mode, a star=200 leadership at lvl 4, and same star taken at level 4 is 1000 leadership when hero is at level 20 and is not useless.