Ex-Staff are exactly just that, Ex-Staff. The same goes for CBA's. They shouldn't have power where it's not needed.
Instead, if needed, why don't we get an extra mod? Not all mods should be on the same time zone for this exact reason.
I just don't like the fact that there can be people out there who can go and edit posts - which can do a lot of damage - and the only repercussion would be that they would lose a rank or get banned/temp banned. A mod has a lot more respect from the entire community and Ex-Staff aren't mods for a reason, whether it be positive or negative.
If this is an issue, why not try to look for another mod? Or re promote old mods.
I'd honestly be more inclined to let CBA's have power to edit posts over Ex-Staff.