Although its not, the day that Dark Knight gets jump... (because there is no doubt in my mind) that is what the character in the back is doing (his belt is getting lifted from the wind as he descends the jump) plus classic jump poses, they are really similar to this one.

http://www.rpgamer.com/games/ff/ff4/...eople/cain.gif
http://images.wikia.com/finalfantasy...in_Artwork.png
http://images.wikia.com/finalfantasy...2-KainPose.png
http://images.wikia.com/finalfantasy...95/CidJump.jpg
http://images2.wikia.nocookie.net/__..._JumpDown.jpeg

That leg is always up, has to be jumping therefore has to be Dragoon, is this not enough conclusive evidence to end the dark knight possibility. Also not to mention why the hell would someone hold the scythe like that? The blade is usually above you, not below you.

Also its not really "different" its about the same different as the MAR's viking/beastmaster/warrior/beserker and the GLA's paladin attires.