Meteor is Time Mage's ultimate spell.
Not in FFXI it isn't. That's all there is to it. You would have SE redo the intro movie and change the chebukkis so they don't cast metor and change shantotto and all that stuff just so XI is consistent with the game that introduced time mage?

Black Mages get Meteor in 2/9 appearances. Time Mages get Meteor in 2/4 appearances.
In other words, both jobs have had it the same number of times, therefore neither job really has claim to it at this time.