*shocking* I have to agree with Xeris for once. I could see Ezri as an Acting First Officer under circumstances of extreme duress, but not as a Captain unless you were to write a story set several years ahead,
Well, this is
set several years ahead, as Destiny
takes place a good four years after Warpath
(The word several
actually means more than two or three but less than many, so by the terms you defined, Destiny
's doing just fine, since it's four years ahead.