When Jack activated the Black Crystal, it looked like everything was going to go right. Surely, of all the Heroes, the fixed point would be the one who could handle the power of all time and space and come out with his own Will intact.
Unfortunately, even with all the power of a Supreme Being, Jack is incapable of conceiving of a world where there isn't one power in the Universe greater than himself.
So when all was said and done? Jack was kicked back out of the heavens, down to Crystallis, with all his Fixed Point properties back in place. He had still accidentally remade himself as the lynchpin holding this universe's time and space together.
Captain Jack Harkness
Unfortunately, even with all the power of a Supreme Being, Jack is incapable of conceiving of a world where there isn't one power in the Universe greater than himself.
So when all was said and done? Jack was kicked back out of the heavens, down to Crystallis, with all his Fixed Point properties back in place. He had still accidentally remade himself as the lynchpin holding this universe's time and space together.
But who was in charge?
Or, more accurately, which one?