PLD pre req is 15CON.. but for cross class abilities yes they are paired with CON and MRD. As for the 5 abilities from them, as someone stated Foresight is useless since PLD wont parry with shield equipped. I would go with. (1) Provoke (2) Cure (3)Sacred Prism* (4) Raise (5)Toss up between Stoneskin and Blood bath. If Spirits within does a good chunk of Dmg.. them blood bath. If not the other ws don't do enough dmg to warrant a spot.

* Sacred Prism cure on the whole group gains massive hate. Also just imagine if sacred Prism could be used with the PLD HP recovery ability..