Time travel always complicates things. I'd ask if you know the Doctor, but 66 is a very specific number. He's not traditionally good at hitting specific numbers unless the TARDIS feels like it. History isn't as written in stone as you think it is, anyway.
We've got some notes and tests written up, but no real answers. You're welcome to look, if you want. Captain Jack Harkness, by the way, hello.