This talk confuses me.

I don't know why people are assuming these jobs would have anything to do with one another or would be branched off of an existing base class. If anything, I would think that both SAM and DRK would be the jobs of entirely new classes; for example, Blade Master (Katana/Great Katana) -> Samurai and Knight (Greatsword) -> Dark Knight. Their fighting styles are not compatible with one another; great katanas (which are curved, single-edged swords) are simply not wielded in the same way as greatswords (which are bigger, straight, and double-edged). DRK could also end up using scythes, which no current DoW class is anything close to.