So in other words, different title having same rank is all good in your book except that you have to role play it because you don't want to implement it.
You seem to think that titles and ranks are two different things. They are not. A title belongs to a rank, you can not seperate them. They are the same, or rather, one is the name of the other.
The guild system does intentionally not specify what exactly a rank is or means, except for the very broad seperation into elder/member/apprentice ranks and the rule that you can not edit ranks above your own.
Aside from this, nothing says that influence, power or whatever are tied to ranks in any form or in which form.
