Want a defensive ability/trait? How about if we die with the Wyvern still alive we get auto Full-Raise (no weakness either) at the cost of killing the Wyvern and Call Wyvern get +10 min on the timer (not exceeding the 20min recast cap), call it Dragonheart (oh hi there, that was something that was native to Dragons in a very familiar FF title)
Also I agree, using Spirit Link as a form of drastic TP gain is a little over rated...especially when DRK have something called Absorb-TP which I believe can be used in quicker intervals than SL and can usually gain the DRK more than what SL would gain for a DRG. (Just making this a point to consider when speaking of functionality vs. practicality vs. potency).
Honestly, I feel Stances for the Dragoon is long over due, the job really needs something to pull us away from the "DRG is defined primarily by what subjob it has equipped" I would really love people to consider /drg as well, stances could do that. But stay away from the attack increase, give us something different.
Offensive stance could be something like a small haste boost (on par with Hasso) when you have a pet out accompanied with an increase in Crit Hit damage+15% and Crit Hit rate+5% (this part is not dependent on whether or not a pet is out)
Defensive stance could be increases rate of parries (grants Tactical Parry) for 2-handed users as well as upon successful parry has a chance to stun the target. Something like that would be neat and DIFFERENT. Make them subjob-able and now we might see pup/drg, smn/drg (melee smn lol), bst/drg or even see new ways for sam to tank with sam/drg. Either way it becomes a job that COULD be used as a subjob also it would add to the main job. Ok, I'm done just thought I would stop in and put in my 2 cent on the subject.