created a new order of Knights Militant to fight his own Great Crusade.

The Emperor created Legions, that some of those Legions evolved into something culturally resembling Knights Militant is really irrelevant.

Especially given that most of this cultural shift occurred during the collapse of the Empire. The first legion is the exception that proves the rule.

They adopted Knight motifs after Caliban. Which again was not planned, as the Emperor had no choice in where the Primarchs were scattered.

Your claim is that the Emperor deliberately recreated orders of Knights Militant is demonstrably wrong. He made Roman-esque legions.

Please point out the Black Templars next. You know, the chapter that didn’t exist until post heresy where the Emperor had no say in the matter.

All this was a deliberate choice by the history buff nerds at GW because guess which order things happened IRL.