As you say, the role they represent varies from clan to clan. This is also true for the permissions each rank has (e.g. being able to recruit) to an extent as they can be changed in the permissions interface under clan settings. There are some permissions that are only available to admin ranks and above though, such as kicking, changing the clan colours, changing the clan motto and changing clan keywords.
Because of that, the ranks for recruit to general are generally used as ranks of progression and are often objectively given (e.g. after a certain amount of time in the clan). Since no real clan power comes with them, it's safe for leaders to give them to people without subjective judgement. Since admin ranks and higher have the ability to kicked, the players chosen for them are often those especially trusted by the leaders and help out with running the clan. Admin to overseer tends to be a progression of trust and involvement in the administration of the clan. Deputies tend to be reserved for the clan founders though.
Of course there are quite a few good clan systems where this isn't the case, but these are the general characteristics of ranks I've seen in many clans.-
Can somebody please tell me who can change the ranks of clannies? I can't find an option to select only deputy owners. I don't want everyone messing around with the ranking as I have one certain person doing it. Hope you can help me.
xx Debz xxsaid: Can somebody please tell me who can change the ranks of clannies? I can't find an option to select only deputy owners. I don't want everyone messing around with the ranking as I have one certain person doing it. Hope you can help me.
The settings to update ranks is set to all Admin+ by default.
This, unfortunately, is unchangeable ~ Sicariu
nonafksaid: What are the lengths of time in a citadel to gain each rank? Ranks in a clan are assigned by those ranked Admin+ in that clan. You should ask the leaders of your clan how to get promoted as none of it is automated.
Additionally, this thread is from April 2015 and unrelated to your question. For future reference, you should create a new thread, or use the ? Clan Help ¿ Thread, to ask questions like this. ~ Sicariu