That doesn't mean anything.
When ninja was added they added a weapon for that class to the behemoth rewards so just because other classes don't have it doesn't mean much.
The fact that only 1 class gets vanity rewards from odin is terrible considering you NEED a ton of people in your server participating in the fate in order to clear it. coupled with the fact that he gets stronger with each clear on your server the rewards are getting near impossible to obtain.
They NEED a new incentive for people who already have those pieces of vanity otherwise they might as well remove the fate from the game.
The sword is already long as hell there is no reason they can't make a 2h variation.