Didn't Q tell us that that the WORLD or HISTORY is not what we know it to be?
How easy would it be for those in power to change history, rewrite it the way they want it to be?
How easy would it be for someone to "verify" that it was Tatiana Nikolaevna in that grave, if they really wanted it covered up?
In a world of coinkydinks, this is a huge coinkydink!