LNC>DRG>SAM ( Samurai )
ARC>BRD>THF( Thief )
GLD>PLD>DRK ( Dark Knight )
MSK(Musketeer)>COR(Corsair)> ??
PUG>MNK>DNC (Dancer)
THM>BLM>BLU (Blue Mage)
CNJ>WHM>RDM (Red Mage)
MRD>WAR>BST (Beast Master)

other jobs classes Fencer witch could also be added to make RDM . Ninja witch could also make SAM or THF . Lots of choices lets wait and see