Also, her 2P after the throw doesn't stun for very long; if you SE at a decent speed she won't have any followups that won't land on block. Her P+K (mid punch) option from it is a GB that gives her +2, though.
Allow me to clarify. My two Kokoro cohorts above me are correct in that nothing is guaranteed from the heichu grab. However, you can NOT block any of the three follow ups. You WILL eat a healthy stun if you just hold block. Your only option is to guess a hold.
The 2P follow up, even on fastest SE, is still +14... and no one is gonna react to SE at the absolute fastest, so essentially it'll be mid to upper teens. Kokoro has plenty of options that are in the mid teens, including moves that lead into a launcher. So even by doing a fast SE, you'll still eat a follow up leading to extended stuns and/or a launcher.
it's risky either way honestly. if I try to grab and it works that's great for me.. but if I don't then I get put on counter throw I believe? or worse. and if I don't do anything I get hit anyways...