I dunno, I've tried to crossup Tsubaki plenty of times with Haku j.B, and every single time I get hit anyway. I can also try baiting it, and she will still have enough time to get out another one before I can hit her. Her 2C pretty much emits a giant BACK OFF radius around her.
Definitely leagues below Mu's though since she gets so much damage off hers and it literally hits behind her.