It would be nice to be able to have co-leaders for several reason.
1) more than one person could do fortifications.
2) when doing war they could split shifts and still have full control.
3) would keep some organization in case leader has device problems or real life problems and cannot get on.
4) during server issues, maybe one would be able to be on if other is locked out.
5) Prevent a "hijack" of a faction. say several jump to help another team and the guy left behind decides to demote people so he is only one with power or just deletes all and uses all faction bonuses to build new team. this has happened in the past.