i feel that a person who earned general should get overlord i dont really see a difference between co and head general they both should hold the same power
i agree with scorpion when the full general thinks that the co general is ready they should both get overlord incase someone hits a clan and the co generals the only one on
a general is more than a main capt, he/she has to watch over everything that goes on in the clan, and help the capt with their problems, also if the clan goes down they go down with it (personal experience)