good God... I was merely pointing out that the manga isn't called 'Thorfinn' and its theme isn't such that it should necessarily restrict itself only to the main character. Jeez...as for your 3 para's, they have nothing to do with what I was trying to say because I never said its called vinland 'saga' BECAUSE there are multiple characters in the story.
EDIT: and even I have read the wikipedia page for the manga :P so I know what influenced the story