Like maybe on the First, there are no "Dragoon's" but perhaps there are some Elfan Uhlans who can't or never learned Jump skills because they never needed to combat drgaobs/dragonsong war never happened. Instead they befriend/tame Dragons and have since learned to weave aether into breath attacks to compliment their spearmanship. Then DRG71+ skills involve classic DRG skills like Holy Breath.

We know from the WoD fight that Paladins are Knights, BLM is Magus, BRD is Ranger, WHM is Devout. Not all jobs have different parallels but some might and I suspect we will learn new skills from them. Like maybe a Time Mage npc teach AST a few time spells, or Red Battlemage teaches RDM some fancier sword arts.