You read the books or something which I didnt sounds like conjecture.
Guess we see his fate but from what i see not only does he have the official king... he left his grandfather to meet a gresuome fate. When he was "supposed" to be exiled. Said nah nigga. You sit right here...
Left him as a bargaining chip. Cause seems like planned it all even with outsting the king when they were caught.
Planned way in advance cause we haven't seen that nigga in dumb long before it was...... OFF WITH HIS HEAD.
PS
If you know whats gonna happen dont talk to me no more. I will click no spoilers..