I thought I had got to grips with the main theories concerning who may be burried in KV64 & KV65 but one more surfaced while I was offline (my apologies again for the delay). In Issue 920 of Al-Ahram Weekly, Dr Hawass says:
You can read the full article on the Al-Ahram site; however, this seems to suggest that the tomb could be for the vizier Amennakht.
As soon as we started our excavation we could feel that the area was
promising. We discovered a cut in the mountain, followed by stairs ending in a
hole in the ground. It looks like the entrance to a tomb, and it is exactly
similar to the entrance of KV63. We recorded many inscriptions nearby, some of
which were already known and others that were found for the first time. One
tells us that a man named Userhat built a tomb for his father, the vizier