So theory time. I saw that no one said anything about this yet and I want to know what other people think of this This will obviously contain spoilers so stop reading here if you haven't read Interlude III.
This is gonna sound wildly out there but what if Vivian is Diana? First we see that Vivian is very fond of caring of plants which is a trait that Diana has shown in some of the flashbacks that we get from Cyrus's memories. Second, she goes on to say that who her father was is classified information. We know what happened to Diana's dad, that he was part of Resoom before he killed himself which would obviously be something that would be kept under wraps and possibly even warrant a name change for Diana. Next she points out that she is fond of the tiger doll because it reminds her of an old friend who was "Sweet and funny" which could definitely describe Damion. We also know that Vivian is not a carrier and is just someone that is kept around for other reasons. This could be very wrong of course, but I felt like there were to many similarities to point out.