Sora
[11] Champion
Well 9B is just as punishable as 6 on block, much faster startup, and actually better on hit than 6. Unless you're looking for pushback, 9B is a much better opition than 6.
Ivy 4B does sound like a good option, but you risk getting hit by a TC (does Mitsu even have any good TCs?). Maybe a 2A recovers fast enough to guard Mitsu's 4B? That would probably be best.
That's exactly what I'm looking for - pushback. But, I agree that 6(B) isn't a good option to begin with. It's simply the best of the worst. I would say just 8wr if you're really reading a 4B.
And no, to my experience, 2A doesn't recover fast enough.