Nice theory Sickscent, I can see that you are using a lot of the most plausible data that the public have access to at this time.
I have a similar theory, but my theory doesn't use as much time travel or time paradoxes, I don't know whether this would be consider as a good or
bad thing, but there you go.
I think that the Grays that we see are an extra-terrestrial, bio-mechanical version of our NASA space probes. I think that it is possible that even
for a race that could be thousands of years ahead of us, that space exploration may be an extremely costly exercise, one that isn't guaranteed to
produce a positive outcome.
Maybe there is a race out there that is sending out fully automated exploration vessels, that have an elegant well designed series of protocols
whenever they come across a world of interest.
These protocols could vary from observational data on approach to a planetary system. The ship would then either set course for the most likely planet
to be bearing life or just miss the system entirely and head out to the nearest interesting system. One such ship may have discovered the Earth many
tens of thousands of years ago. It may have sent down automated probes first, perhaps similar to the drones that have been observed around the US this
year. When the drones came across an early form of man they sent the signal to the mother-ship to enter into stage three. The exploration ship then
used it's automated gene lab to produce a form of bio-mechanical being that would be similar enough to us to communicate.
These bio-mechanical beings would have been an early form of Gray, similar enough to us to effectively communicate, but also emotionally neutral so as
not to jeopardize their mission.
As these beings developed a relationship with us they may have produced genetic crossbreeds that would be much better suited to communicate with us.
Now even though these beings had discovered what we call an intelligent species (by our own standards of course), it still may be a huge effort for
the original Grays to travel from their homeworld to the Earth. I think that the there may have been groups that have travelled from different systems
to the Earth, but I think that there are very few of these beings here and that these are the guys that us abdutees are calling the doctors or the
masters.
To cut this theory short, I will say that I think that the 2012 prophesy is in reference to the earliest date that the grays are able to open a
wormhole between our two planetary systems, to allow true first contact between ourselves and the true galactic community. I understand that the
energy requirements for a stable wormhole are huge, so maybe the time since the 2012 prophecy was first written and the time to that actual date is a
pretty reasonable amount of time for the construction of this interstellar portal.
I think that this could be why the Grays haven't made contact so far, it could be because they do not wish do do so until they are able to prevent us
from using their own technology to war against ourselves or any nearby cultures.
I other words they are not prepared to make contact until they can guarantee that they can us from biting them in the ass.
OMG Aliens are so real, (that is a name not a statement) I used to live in Keighley in West Yorkshire and used to travel to Skipton fairly often,
small world eh.