What is the biggest single damage number possible (no LB)

[Alenore]

have you even played as a dragoon? saying that a blm hits 2k per 10 seconds is realistic. and that number miltiplies when you count AoE. Any dragoon, even the best geared ones, have NEVER done 500 damage per one second. for a dragoon to deal 2k damage, even with all his buffs, it would take way more than ten seconds.

If I consider nothing crits :
Jump w/ PS 700, True thrust 350, Vorpal thrust 500, Full thrust 700, under BfB, HT and target under Disembowel.

Add to this : Dragonfire Dive, LS for a crit (1k1) on FT or Jump, Leg Sweep AND the dots ticking at least 3 times.

the day that my dragoon can help complete AK in 10 minutes that is the day i will say dps is balanced...

You're comparing the job with the best AOEs, buffed by BRD, killing a shitload of monsters against... A class made for single target.
DPS might not be balanced, but this is not what DPS is.

You can do much more than 2k in 2 seconds.