For me the term "balance" always sounded odd, because it would basically mean that both the light and the dark side would be equally strong if the force was "balanced"
But maybe, since he switched between sides at least twice, he was able to merge both sides and balance them out, so he could use whatever was most useful to him from either side in any given situation?
Maybe that was it he did in the end? He used the powers of the dark side to kill the Emperor in favor of the light. So he balanced it alright.
“It appeared that there had even been demonstrations to thank Big Brother for raising the chocolate ration to twenty grams a week. And only yesterday, he reflected, it had been announced that the ration was to be reduced to twenty grams a week. Was it possible that they could swallow that, after only twenty-four hours? Yes, they swallowed it.”
- George Orwell, ‘1984’
