And as I've said before in dozens of posts, if Divinity 3 is going to be the end of Damian, then at it's heart, the story is of a father having to kill his foster son. Emotionally, it is the right thing to do to have the Divine be the one to kill Damian.
Story-wise, it is also the right thing to do - remember that the reason the Dragon Knight had to go through all the hullabaloo to enter the Hall of Echoes is because Damian is a demigod, and flat-out out-classed the Dragon Knight and everyone. That was the key part of the DKS story - Damian was too powerful to be defeated straight-up. The Divine is also a demigod, and is thus of equal power.
They can't have a non-Divine character do all the work in a boss fight and then bring in the Divine for a finisher cutscene. That won't be satisfying for the player - unless they were controlling the Divine. It won't do to build up a fresh character new to the series and play them for 50 hours only to switch to the Divine for the end. Therefore, I think you should play as the Divine for at least part of the game. Maybe that means playing as the Divine for the entire game, maybe it means switching between two or more different playable characters (which might include a Dragon Knight).
I don't mind if they bring a Dragon Knight into Divinity 3 - either a new character or the DKS Dragon Knight, but The Divine has to finish Damian. That's the heart of the conflict, not anything to do with the Dragon Knight.
I will tell you once again: Finish Divine Divinity before you decide that it's wrong to have the Divine as a character in Divinity 3.
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In a post I read recently, Macbeth said that they wanted a confrontation with Rhode in DKS, but ran out of time to do it. It was not an attempt to spite the player.
