Like i said befor, even though the dragon knight had no special connections with the divine i belive they could give the dragon knight even more of a story with helping the divine get to his goal.
Hell to be honest something i think would be another cool thing is a 2 person story as in you start out as a new member to the divinity story and go though what ever is needed story wise but later on you meet the dragon knight and from then on out when ever is needed or i guess wanted you could switch in between the 2 each haveing there own ups and downs of course, seeing how it would not make much use of the new guy, you could only play as the dragon knight as a dragon and fight in the air,then fight on land as the new hero.