Index's memories (and Touma's) weren't erased, they were destroyed. There's nothing to recover so IB can't do anything.
Quote:
This was less amnesia and more a case of complete memory destruction.
The words the doctor had told Index in that freezing summer examination room floated up in the back of her mind.
He did not just “forget” his memories. The brain cells were physically destroyed. I really don’t see how he could remember those things again. Honestly, did someone open up his skull and jam a stun gun inside?
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