As shown in LotFB, Darius's original hidden blade was designed to be worn on top of the wrist, and it wasn't until the blade was passed to Bayek that it began to be worn on the inner arm. This can be chalked up to the fact that Bayek was never told how exactly to wear the blade and decided to wear the blade on the inside of the wrist.
In the final end, Bayek and Amunet are in a cave addressing a set of assassins on the Creed they have formed. Tahira and others stand and listen as Amunet and Bayek explain the Hidden One's Creed Dracula’s Sword In AC Revelations Honors Vlad, The Impaler. Another of Assassin’s Creed ’s coolest weapons was held by Assassin’s Creed’s: Revelations ’ cape-wearing Ezio. Vlad Tepes’ Sword was, originally, the sword of the leader of Wallachia himself. Due to his ruthlessness, he became known as Vlad, the Impaler, and in fiction With Bayek, the hidden blade could be used without cutting a finger. The end of the game showed that other hidden ones cut their finger to honor Bayek, to show respect/trust. In AC1, the hidden blade design was changes to require a finger cut..I feel like they did this for the recruits to show trust/confidence in the brotherhood.
The Creed of the Assassin Brotherhood teaches us that nothing is forbidden to us. Once, I thought that meant we were free to do as we would. To pursue our ideals, no matter the cost. I understand now. Not a grant of permission. The Creed is a warning.Arno Dorian, reflecting on his perception of the Creed, 1794. Arno Victor Dorian (born 1768) was a member of the French Brotherhood of Assassins

It doesn't matter how you consider Dario, that he invented these techniques is clear in Origins when Bayek begins to understand the foundation of the blade is when Aya tells him that she grabbed the two hidden blades from Dario's grave and with it the first teachings of how be used.

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does bayek have a hidden blade