I haven't had much experience playing Midori against other people (Sotek stop being sick!), but my suspicion is that a) the animation isn't final, and b) it's probably fine? Geiger (DP), Jaina (DP, ground super?), and Grave (Sword? and ground super) all have startup-invulnerable options they can use, so trying to headbutt a KD one of them is just asking to get hit I think. I'm not sure what the interaction with Rook's WMC would be, but there's a chance that Midori gets thrown. If not, though, that's probably also fine because most of the rest of that MU was pretty hard for Midori.
I'm pretty sure DeGrey can stand-up super counter it if he has meter, which means he can be safe from it most of the time, and I think that's probably okay?
I'd be a little concerned about the Setsuki and Val matchups, but I don't know how those MUs are right now. Neither of them has an invulnerable startup ground move, I think, and they both also have 5hp.
Obviously no information about Lum or Arg yet.
tl;dr: It might be a problem against rushdown characters, but currently most of the characters probably have some good option available at least sometimes. And also there's the animation finalization to consider.