Maybe you focus too much on the characters but missing the point of items.
I am pretty convinced that Rake/Traveller clash will come in a while but not because of them but because of the swords. Maybe Dragnipur (Draconus) developed some influence over the state of affairs (or Rake's actions). On the other hand Vengeance is too much involved in Shadow Throne to be "just" the sword.
The question is: Are the characters are wielding the swords or the swords characters

(yeah, yeah, another crazy theory)