In my understanding, he gave a part of the flame to his brother to protect the castle when he's out of war, I mean, someone needs to defend their wall right when he's out right? They need someone stronger. He's still the duke, and he still got some flames power to properly weild the disaster sword. But I'm not sure if that's really it.
i swear yall need to read…his entire goal here is to make the dimitri dukedom self sustaining and the best that no one can look down. he can’t do that alone, and that’s why he’s fostering talents like chris the hector guy and even buying out mage towers. it makes logical sense why he’d want rodwell to be prepared in case he isn’t there to defeat dimitri?? like you don’t put all your eggs in one basket, that’s dumb asf.

Why tf he stepping down of the lord position plus giving the flame demon too him???wtf a lot of nerf and weak