Board Thread:Wiki-Related Discussion/@comment-24304025-20140505134054/@comment-24304025-20140505143358

The potion is proof that he was cursed. He had to drink the potion to remember. He says "we don't need to remember" and sends the potion to Hook. Since he did not drink the potion, he forgot everythign. Even when he left Gold's body he did not know about Zelena.