Looking back at the topic and considering Yoshida's thoughts on this at this time...

I think that if a Dragoon were to have a pet, that the abilities the Dragoon would be doing anyway would have bonuses.

Weapon Skill 3 has deals damage, triggers wyvern breath, has moderate cooldown as to not be spammed.
A combo from Weapon Skill 1 to Weapon Skill 3 boosts the wyvern's breath attack (combo of choice).
A combo from Weapon Skill 2 to Weapon Skill 3 causes wyvern's breath attack to AoE.
A combo from Weapon Skill 1 to Weapon Skill 4 ignores defense when attacking (use while WS3 on CD or if wyvern dies).
Wyvern pet dies, Dragoon still has a damage output comparable to other DDs. If wyvern is alive and proper abilities used, Dragoon has the capacity to easily do more damage than other DDs.

*attempts to toss the idea out there like a frisbee, but it gets shot down by bbqsauce arrows*