For the fun of it. Also, once you have about 75% overall completion, all the christina missions will be unlocked. Just stuff like that. --- Like my mother always used to say: "A watched torrent never downloads."
lol you need to slow down and absorb what you're reading. Christina Missions, you may have done a mission involving her already. Her symbols on the map are the torn hearts. --- http://wearearcade.com/features/feature-paradigm-shift/ WRPGS rise through the ashes of the JRPG.
Remember that girl you drop in on at the very beginning of AC2? The Christina missions flash back to memories involving her that we haven't seen yet. It's pretty interesting, really. --- Your intelligence has decreased by 1 point.