i'm kind of surprised sun tzu isn't there, other than being 'too famous'.
ghenghis khan would be good.
hannibal barca was amazing, though the moloch worship might check them. throwing babies on a fire and all that. (not him personally, but his cultural taint.)
general giap is important though controversial.
julius caesar is a literally classical choice, though we have his lady cleopatra to represent that era.
zhukov would be good.
alcibiades was like alexander in his exceptional success, though i'm tainted by a western perspective.
the spartan gylippus; when besieged syracuse asked sparta for help, they sent one general (and his guard) and he destroyed the siege (and an era of athenian power).
every time they add a general they improve the 'general' power dynamic.. they might not add any more.