My main problem with Vedek Kira is even if you accept that Kira would leave a military life and go into the religious order (which isn't completely out of character) how did she get to a position that's roughly analogous to a Bishop in only five years or so?
But then I guess Star Trek in general is never the place for realistic rank progression.
She's the Emissarys bestie. And the whole order seems to only have two ranks....priest and Pope. (Or vicar and archbishop) I can't imagine her not having the chops to go high there...her dead lover was vedek Bareil, her best mate was the singular most important religious figure on the planet, her other friends included first ministers, and she personally was possessed by a prophet in full public view. The only amazing thing is she didn't think to use all this to try and depose Winn....back then I guess she was enjoying being the right thumping hand of God.