I thought Ian remembered everything and thats why so many chapters were flashbacks....
BUT NO DA** IT!!!!! 
BUT NO DA** IT!!!!! Comment by ANK on Eternal Contract - Season.2 Chapter 107
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@ANK That's been my understanding, too. Otherwise placing this eternal flashback during the main story doesn't make sense: just for readers to know how it all happend? - I'd gladly be left without that knowledge.