I felt like Cid and Mid should have been playable characters at some point in the game. I think that the story could have allowed for pretty much anyone to inherit the powers of the crystals with a little tweaking. The story for Final Fantasy V makes sure to stress that Bartz, Lenna, Faris, Galuf, and Krile were especially chosen, but a little tweaking could allow pretty much any character in the game to specifically claim one of the powers from the crystals.

Final Fantasy V and Final Fantasy X-2 have interesting parallels in the sense that their heroes gain power from the heroes who went before them, yet it almost never addresses the previous heroes from which their powers are derived.