This may be a stupid question, but after reading this theory I picked up my copy of Elantris and had a look at the list of Aons at the end. Aon Ati wasn't one of them. When have we been presented with that design?
For clarification, I have the UK edition of Elantris and it is not the 10th anniversary edition. Could it be something that was included in the 10th anniversary edition?