I starting to speculate if the dual sword person is Lucius , an assassin who was just bad influence on Patroklos, his nephew.
Or that he could be Ivy's half brother or such. That may explain his switched style to use his lance as if were to be used as two swords (like Carvantes.)
I'm just babblin'.
I just thought of ANOTHER contradiction by the writers.
According to NLOPS, Inferno lost to Siegfried during SCIV because he couldn't unleash all his powers due to possessing a dead host. However, he's in the Astral Chaos. In other words, there's no reason for Inferno not to just ditch the body he was in command of and walk freely, and kick Siegfried's ass and then take over his body.
'Saw your post on Harada teases thread. Soul Edge I think was the only SE/SC game that when you had the "You Win"/"You Lose" screen sequence, the warriors are still exactly positioned as they were when the previous battle ended: knocked out or ringed out. I would wish they'd do that for 6.