So there's really debate about who was stabbed at the end of this episode? Why? Its not saul. Cj's reaction wouldn't have been to just scream, and why wouldn't she just rush after scratch and continue the fight in a rage?

Its not scratch. Katana's are primarily slice weapons, not stab. So if cj had succeeded, the sound would have been different in my opinion.

Its not burt........but it should have been.....Goddammit

Leaves us with just cj. Who screams upon blade impact. And has a gutteral grunt when you hear the blade removed.

Of course there's always scratch talking at the end. Listen back to the episode just before scratch stabs durai. Same speech patterns can be heard.