Not sure if its a strike or command grab but I think the Izuna exists to stop the opponent from upbacking Hibiki's command jump mixup.
Watching the footage it looks like he has BB followups to all his B normals. Which was stated in his command list iirc. His overhead is interesting where I thought it was a C normal. But he always went into 5B afterwards then did 5C. Unless he has reverse gats, I think his overheads a B normal. Not sure which direction it is though. The hop into downward slash move also has a followup slash exclusive to it so its most likely a B normal as well. What I find most interesting about him though his how after he uses 5D (bushin dash) he can go into standard normals after he teleports from the inital slash (Goes into 5BB > 5C > Combo after it connects). And the recovery on the move almost seems nonexistent. He also has a move where he retracts a blade from its handle and it hits the ground like Hazama 6C. Have no idea what possible use it could have
I would do screens on which normals I think are which but thats going to take awhile. I made note and descriptions of them to myself so I dont know how helpful it would be for other people