I was a little confused by the replay files. What that should be is one replay with kohaku vs warcueid and one with sion vs kohaku.
The first was pretty much to show how imbalanced kohaku really is, even if it displays quite clearly in your replays too (normal EX attack that does 6k damage? wtf???). I've added another imbalance, the dual sword slash and scabbard attack. It's good for 3k damage, and takes no effort really
The first replay I guess is to show how to defend vs warcuied, since she has low health but high damage. When watching the replays, that seemed to be your worst matchup.
The second is me with Sion vs Kohaku. Now, while I have forgotten how to properly do the air combo, I think those replays show how bloody imbalanced Kohaku is! I mean, compare the amount of health I lost when playing with Kohaku against warcueid (I NEVER play Kohaku) and what I lost with Sion vs Kohaku (I ALWAYS play Sion, even if it was a long time since I played)