Story falls apart at the end...

[Ravno]

I'm a Paladin. Some old folk ask me to kill some dudes and let my sword eat their soul. Sound kinda weird right ?
I mean those guys with a sword eating souls are not know to be good and respected paladins :



Then, i got some old book about an other knight and i'm asked to kill the same dude he did in his book (and feed my HOLY sword with their SOULS !).

So i got my first book, asking me to kill some specific dude. A 2nd Cohort Laquearius.
It has to be this guy, that dont work with 1st Cohort Laquearius or 2nd Cohort Hoplomachus who fight on his side.
So if that book is so old and i have to kill (AND FEED MY HOLY SWORD WITH THEIR SOULS !) the same dudes than in the story, why should i kill some Garlean Empire soldier ?
The story is old and these soldiers were not here few years ago ! Garlemald was still "a small, remote nation which held little more than a fraction of the northlands".

And then i got my second book, asking me this time to kill some 2nd Cohort Hoplomachus (AND FEED MY HOLY SWORD WITH THEIR SOULS !!!) . Ok, i already kill a buch of them while i was stealing souls of his friend, 2nd Cohort Laquearius. Why did i need to read in the book about a story of an old dude who killed a 2nd Cohort Hoplomachus (and that's a fake since there were no Garlean Empire back then) before to be able to steal their souls ? Since i already kill a lot of them, i should already have their souls.

Anyway, that's a storyline who make sense. Genius.