Sir Hekhtur

Sir Hekhtur Cerberan is the Freeblade who pilots Canis Rex, last loyal Knight of House Cerberan after Iron Warriors took Randoryn Alpha and tried to recondition the nobles into treachery. The suit woke itself, broke his chains, and made a Chainbreaker out of a prisoner.

He got serfs off-world, stole a frigate, and has been hunting wars he can still win for the Imperium ever since. Freedom's Hand is the gauntlet. The oath is the rest of the machine. Randoryn Alpha is lost. The Knight is not interested in dying to prove the point twice.

House Cerberan is gone. Hekhtur is not. That is the Freeblade argument in one surviving Knight.