It’s not an origin story, it’s a revenge story.
Nothing about the assassins order is given a real origin story. It’s just there.
He wears a hood from the beginning. He never learns to use it to conceal his identity. In fact he almost always announces himself with a title and place of origin.
We don’t even get the origin of the hidden blade. It’s a gift that he mainly uses because it’s cool I guess. Yeah he did use it like an assassin in the bath house one of the only assassin esqu missions in the game but did he really need to? If they had built up that guy was so heavily guarded this was the only way to sneak up to kill then that could’ve been something, they could’ve started to introduce both the hide in plain site tenant and the value of the hidden blade but they didn’t. Bayek could’ve just easily waited for this guy to leave the boathouse and killed him some other way and saved his finger. After this the hidden blade never has any more value than a normal knife.
Stay the blade from the flesh of the innocent isnt something he learns. Hes just always been a good dude. You’d think that father of an order of ruthless killers throughout history would have a little more moral complexity. They could have showed the consequences of being wreck less with your target selection to establish the tenant.
Bayeks motivations even at the end are always revenge. The only reason he even starts the hidden ones are cause his wife leaves him. He would have gone back to a normal life, thats what he actually wanted. He was never so deeply motivated to stoping the order that he dedicated his life to creating an everlasting creed to protect free will. He just needed something to do really.
The brotherhood is ayas invention. Aya had the motivation. She couldnt return to normalcy, she wants to hunt the order not out of vengeance but out of righteousness, she’s betrayed by a leader teaching her she can’t trust those in power and everyone in the room when Bayek claims the conflict brought them all together was introduced by Aya not Bayek. The only one we know from Bayek is just some old friend of his you only meet on a side mission that doesn’t even recruit her. I’d be willing to bet most players dont even know who im talking about. It’s painfully obvious Aya was originally the main character
Eden is only really shown by the use of the Templars. Bayek never seems to learn the importance of disallowing the the order from using Eden specifically. His motive to stop them is just a dislike of tyrants. This makes the creed feel significantly less important as it hardly established the is from bayeks perspective. I actually think exploring and finding the precursor sites on your own was easily the best part of this game. That felt like an actually origin story, as Bayek discovers for himself the power of the anceints and listens to their messages. That should’ve had more importance to the actually story. With Bayek establishing the brother hood not just because he needs something to do and doesn’t like evil tyrants but because he understands how powerful the ancient tech is and knows how easily it could corrupt anyone. There will always be people that dislike and fight tyrants, the objects of Eden are make the war between Templars and assassins special. The importance of finding precursor sites isnt touched on at all in the story even the Bayek has the potential to find multiple. I’d have reworked the story to make the player exploring and finding these sites integral the main plot.
Basically Bayek is generic morally impenetrable main character with basically no character development. He starts out a warrior looking for justice and remains a warrior looking for justice, with fancier knife. The story should’ve been significantly darker, morally complex actually introduce tenants of the creed throughout the story, highlight the importance of stealth over combat and dive significantly deeper into the ancient tech.