A dhjan's mate is bound to his people, to his birthright as he is.
But it really is no different than me thinking it is my birthright to be able to have freedom of speech.
He'd continue the war until he won back his planet and birthright by force, then find another way to heal his planet.
From the theological standpoint every individual is predestined either by his natural birthright to evil or by Divine Grace to good, and the absolute foreknowledge and omnipotence of God excludes even the possibility of any initiative on the part of the individual by means of which he might influence God's timeless choice.
1 seq., where the birthright (after Reuben was degraded) is explicitly conferred upon Joseph (Ephraim and Manasseh).