I don't know if this has been mentioned elsewhere but I just noticed in a video that when Izanami does her barrier draining command throw it will add to her Health instead of her Barrier gauge if her Barrier is full.
6B or Forward B only ever did 1 hit, I think your confusing the fact it also has the C follow-up that 5C or Neutral C has.
Also Makoto's new Special can be used after her Back Throw or her Crush Trigger.
It sounds like the recorded audio input was too high in the second video causing it to peak which caused some audio distortions which made it sound more crackly on it's output.
I was there recording those matches as well. You started a bit before me but here's my recording as well with (slightly) less echo and the screen cut to just the gameplay.
http://www.youtube.com/watch?v=FMTnxJVTTes&feature=plcp
It must have been something with the stream that caused the echo.