So we know that some if not all the messages received were made by savathun pretending to be the various writers. In the first Eris letter the number 8 appears in the wrong place and in another lore page it says Cayde-8. Now maybe it's the font style but there are some spaces between words which seem... bigger than they should be, also I think I spotted capital letters where they shouldn't be. I wonder if putting them all together, if there is something to put together will unlock an emblem code or something. I can't check the pages on the app because they are being hidden to avoid spoilers or something.