User blog comment:CNBA3/Chapter 413 Review/@comment-4829046-20141222130143/@comment-1359322-20141222143329

The CSK calls literally calls all his friends, "old friend", not just Lucy, he used that on Leo, Natsu, Gray, Erza etc. What's so special about CSK calling Lucy "old friend". And yes maybe Layla did tell Lucy about the One Magic, but what does that prove? It could just be something Layla hear from someone else and Layla just told Lucy that as some bed time story.

Also in Zoldeo's flashback, we were shown Layla giving up her keys due to her illness.