Allow me to take a different, simpler perspective on this subject of randomness..
I just tried a simple experiment, simply flipping a coin 8 times. The results should give me a random byte, right?
Not particularly. My coin flips gave me 'Heads, Tails, Heads, Tails, Tails, Tails, Heads, Tails'
That gives me the binary sequence of '10100010'
Now, it would seem this should be fairly random, but one byte of information should have an equal randomness of the numbers from 0 trough 255. Should...
But it almost certainly will not. It'll produce something closer, if not basically identical, to the Bell Curve in statistics. You're almost guaranteed the lowest chances of generating '00000000' or '11111111' using such a simple binary coin flip for each bit. Not to say it won't happen, it's just less likely in the long run experiment.
As I conclude this comment, I flipped it once more. Heads.