Acctually yeah that's a good point when you say no memories is it a no memories but contextless knowledge remains or is it just everything is gone in entirety? I, and I think most of us for that matter, was under the impression that our knowledge still remained, but our memories, while still there, were damaged to the point of being unable to paint a proper picture of our old lives beyond a few fractured details. 

I don't think I've made too much mention to a past life beyond Aya recalling that she remembered having another name previously though not what that name was and a few references to things like the rope trap which she New of but not how to make, but if I was mistaken about the amount of knowledge we came in with I'm happy to retcon anything.