Concerns regarding current concensus theory of The Big Bang, size of universe and speed of light.?

Most suggest the 'age' of the universe is 13-14 billion years old. The Big Bang occurred and the universe has been expanding since. Recent observations regarding gamma ray detection from large black holes at the 'edge' of the universe are 10 billion LIGHT YEARS AWAY. My problem. If everything that IS was created at the Big Bang, the universe is expanding, the speed of light is truly a constant, m cannot travel at the speed of light and E=mc2 is correct(to help determine 'distance' of gamma ray bursts from black holes), then how can we be detecting gamma rays that are 10 billion light years away. If they are 10 billion light years away, then the radiation we are now detecting happened 10 billion years ago, and 10 billion years ago the universe was much smaller(for instance, the Milky Way Galaxy, or its primordial precursor, WOULD HAVE BEEN CLOSER TO THE BLACK HOLE whose gamma rays we are now detecting) then it is today. And if m cannot travel the speed of light and E=mc2 is correct, then we should not be able to 'see', 'detect' radiation that takes 10 billion light years to get to us. Because 10 billion years ago those gamma rays could not have been 10 billion light years away, because the universe, or more specifically, light from the Big Bang 10 billion years ago could only have an outer reaching diameter of about 6 billion light years.(light goes in both directions). Thus, my problem. Convoluted yes, but it just don't add up! Any takers on non-linear speed of light?