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Still a mixup because of A throwI've only tested TJ frames for Nat's moves down to the exact numbers, can't speak for other characters' TJ frames.
As for cancelling the crouch, you seem to have misread what I typed - after cancelling FC with KUZ, she may also have frames to TJ over grab attempts with Jump A/B. This is better than simply going back into standing and guessing the grab mixup, if she's cancelling the crouch.