Enma being in any way more special than Yoru would be beyond stupid. It is, at multiple points, identified as the most powerful of all swords. If Enma kills you if you touch it and are deemed unworthy, Yoru should do the same. And there is no fucking way a backstabbing motherfucker like Shiryu is worthy of it.
Like, it is made clear that all "cursed swords" are not even actually cursed but want a strong guy to wield them and kill people. That is all Enma encourages at the end of the day. It just makes sense for Yoru to be basically that but better due to its status as not only a blackbade but the greatest of all swords.