I think it was in a Live Letter when Yoshi-P talked about why DRK was a tank, and the reason was that they were thinking about a 2h Sword tank, and there were 2 posibilities; DRK and SAM.

So, if DRK is tank, them SAM should be a DPS unless SE wants a second sank using 2h Swords (or a healer using G.Katanas, like "I have a wound on my arm!" *SAM cuts the arm, wound gone* "Thank you, SAM!").