Yeah Jason's B122 has weird blockstun but it is possible to punish with 7 frame normals. Leatherface's F1 punishes it. Jin's standing 2 should probably punish it too, it's just weird timing. Practice it by blocking the whole string low then letting go of down as soon as the last hit touches you. You'll be jailed into a crouching stance by the blockstun and the frame you come up is the frame you can do a normal to punish
Pretty sure this is incorrect, reversals aren't one frame faster on startup they just come out one frame earlier than the window for normals to hit.